The stage event for Godzilla: Monster Planet at Anime Japan has announced that the film is part of a planned trilogy, it also announced the characters, as well as which actors are playing each, and revealed the character designs too (bottom). 
​
Mamoru Miyano is playing the lead role, Haruo Sakaki, a 24 year old looking for revenge against Godzilla for killing his parents.
Takahiro Sakurai plays Metphies, the Exif alien who understands Haruo well.
Kana Hanazawa plays the heroine Yuko Tani, who grew up with Haruo after he was orphaned.
Tomokazu Sugita plays Martin Lazzari, an optimistic environmental biologist working with the military.
Yuuki Kaji plays Adam Bindewald, a young landing ship pilot who respects Haruo.
Junichi Suwabe plays Mulu-Elu Galu-gu, a Bilsard alien.

​Official synopsis:
The last summer of the 20th Century. That day, the human beings learn that they are not the only ruler of the planet Earth.
The appearance of the giant living creatures “Kaiju's” and the ultimate existence that destroys all monsters: Godzilla. Through the battle against kaiju's that lasted for half a century, human beings has experienced continuous defeat, and finally plans to escape from the Earth. And in 2048, only those who were selected by the A.I. managed under the central government boarded the inter-sidereal emigrant spaceship “Aratrum” to head for “Tau Cetus e”, the planet beyond the distance of 11.9 light-year. However, the environmental condition differences between that of the Earth and Tau e, which they finally arrived after 20 years were far beyond the predicted numbers, and was not an environment considered to be habitable by human beings.

The young man on the emigrant ship: Haruo, who saw his parents killed by Godzilla in front of his eyes when he was 4 years old, had only one thing in his mind for 20 years: to return to the Earth and defeat Godzilla. Shut out from the possibility of emigration, as the living environment in the ship deteriorates, the group of “Earth Returnists” led by Haruo became the majority, and determines to head back to Earth through a dangerous long-distance hyperspace navigation. However, the Earth they have returned has already passed the time of 20,000 years, and has become an unknown world with the ecosystem reigned by Godzilla.

At the end, will human beings win back the Earth? And what will Haruo see beyond his fate?

We posted the reveals for Godzilla: Monster Planet the poster, sysnopis, but we also posted the "top secret" folder promo for Anime Japan now we know what is in it. It incluceds a timeline, as well as a map, and what appears to possible by info on the ship/mecha. This info comes via 方昭凱 (Yakumo Yukari) on Facebook. Below are some of the translations of the info, at bottom is the documents. This was also posted by him (possibly a better translation of parts of it) - "Here's the background information and general timeline of Urobuchi's Godzilla Anime Movie :
The first Kaiju,Kamacuras,attacked New York in 1999
Dogora appeared in London in 2002
Rodan,Anguirus attacked Beijing in 2005
Daghara attacked Sydney in 2017
Orga attacked Turkey in 2022
Godzilla first appeared in 2030
He literally destroyed Los Angeles and San Francisco 
as well as killing 3 other kaijus.
Human,along with alien races allying with human
was no match to Godzilla......"

​(Full document translation)
Godzilla Monster report
This is the important message released today in Animejapan 2017
The Monster Disaster report, which has been endured by the earth.
A few monsters are familiar with the report.

For the first time in the earth, the monster of land in New York, in 1999
For the first time in 2030,

▉ [1] New York, USA, may 1999
Monster calls: Ma / presumptive casualties: Approximately 2500 people
The great creature that was initially confirmed "monsters". from the south west of the New York Islands, suddenly appeared in the gulf sea. In the 72-hour period, 330 km from the North East direction. The region has been damaged by the destruction of the finally, the finally of the air of the air, the air force in the suburbs of Boston.
The emergence of the "Monsters" is the hypothesis that the phase of the earth's environment has evolved.
▉ [2] London, England, September 2002
Monster calls: Togo / presumptive casualties: Approximately 3900 people
▉ [3] Chinese people's Republic of China in November 2005 ~ Beijing
Monster calls :. / / presumptive casualties: Approximately 8200 people
※ biological, "Black of" is successful. The Province of hebei is contaminated.
▉ [4] Federal, Australia, February 2017, New York
A monster called: da of / presumptive casualties: About 6700 million people
The Non-confirmed substances released from monsters have caused bacteria infection. The spread of the east coast of Australia.
▉ [5] Its-Ann, Turkey, may 2022
Monster calls: European / presumptive casualties: Approximately 1150 people
▉ [6] 2030 in the west coast of the United States of America, there are different "Monsters" so far.
Monster calls: of / presumed dead and injured: About 8700 million people / human survival circle ensures rates: 56 %/ world population = 2300 billion
Los Angeles ~ San Francisco is destroyed. It has caused a massive disaster of the past "Monsters" individuals.
The other three-body monsters, which appeared at the same time, were wiped out by " ji
▉ [7] ji destroyed western Europe, and the total attacks on the EU forces failed.
There are monsters: of / presumptive casualties: Approximately 6000 million people / human survival circle ensures rates: 30 %/ world population = 2000 billion
The French Capital of Paris has fallen. The entire region of Europe has been evacuated.
- the alien "at" came to London in 2035
- the alien ", " came to New York in 2036
▉ [8] Human, at,-three ethnic groups are composed of " Earth
Human and -, at, in partnership with the advancement of science and technology, have been successful in the battle of Europe. To accelerate the development of the production system for the weapons of the beast, the effective strategy for of remains unknown.
▉ [9] activities of the "ji" activity in 2042 (out xiàn time = 8 times)
There are monsters: of / presumptive casualties: 19 billion people / human survival circle ensuring rates: 19 %/ world population = presumed 1020 billion people
Circle of survival: 50 % of the northern coast of the United States of America
▼ the plan team starts moving ▼
The selection of candidates for the selection of the earth. The need to introduce the necessary inter-star migration vessels to begin construction.
The temporary central government has moved to the current brazilian suburbs.
- [10] in 2045, the " great great wall operation " was put in place in the " Wall " to the eurasian continent.
A nuclear bomb was destroyed in the plains near the eurasian continent.
A Major Fault Belt (Width: 1 KM / depth: 800 M / 800 km), successfully delayed the "ji" year.
▉ [11] January 2046 "ji" Breakthrough Indian defence line
There are monsters: of / presumptive casualties: 200 billion people / human survival circle ensures rate: 13 %/ world population = 800 billion
The Hotline use on the mainland plate róng jiě a part of the Himalayas and escaped from the big fault. Starting to break the Indian defense line, the gulf of bengal disappears.
▉ [12] on March 12, Japan, Japan. Final battle of of
Loss of -
On the Indian Peninsula, the humans of Japan have followed the withdrawal.
There are monsters: of / presumptive casualties: 100 billion people / human survival circle ensures rate: 11 %/ world population = 700 billion
- [13] 2048 "the earth space alien migrant scheme" intended to be implemented

The Godzilla Anime website has been official updated with the release date and official synopsis of the film. Godzilla: Kaiju Planet (Godzilla: Kaijū Wakusei), is the official title, and their Twitter page also posted a few more pics one a "top secret" folder (Anime Japan giveaway/promo) and the other being another concept pic (bottom). The official synopsis is below. Also of note the site has been updated but is very slow, there are "mecha" of some type shown but at this point not "clickable".

"The last summer of the 20th Century. That day, the human beings learn that they are not the only ruler of the planet Earth.

The appearance of the giant living creatures “Kaiju's” and the ultimate existence that destroys all monsters: Godzilla. Through the battle against kaiju's that lasted for half a century, human beings has experienced continuous defeat, and finally plans to escape from the Earth. And in 2048, only those who were selected by the A.I. managed under the central government boarded the inter-sidereal emigrant spaceship “Aratrum” to head for “Tau Cetus e”, the planet beyond the distance of 11.9 light-year. However, the environmental condition differences between that of the Earth and Tau e, which they finally arrived after 20 years were far beyond the predicted numbers, and was not an environment considered to be habitable by human beings.

The young man on the emigrant ship: Haruo, who saw his parents killed by Godzilla in front of his eyes when he was 4 years old, had only one thing in his mind for 20 years: to return to the Earth and defeat Godzilla. Shut out from the possibility of emigration, as the living environment in the ship deteriorates, the group of “Earth Returnists” led by Haruo became the majority, and determines to head back to Earth through a dangerous long-distance hyperspace navigation. However, the Earth they have returned has already passed the time of 20,000 years, and has become an unknown world with the ecosystem reigned by Godzilla.

At the end, will human beings win back the Earth? And what will Haruo see beyond his fate?"

The Godzilla Anime countdown to Anime Japan continues with another new concept art reveal, from the accompanying Tweet there will be a large scale reveal at Anime Japan. There is also a statement that sounds like we may see a certain "mecha", maybe.
"5 more days to AJ 2017  We finally got 5 days to announce new information! It is "concept art" of the fourth countdown project. In the TOHO animation booth (East 6 Hall: J82), there is also a large-scale banner exhibition of key visuals and a reproduction exhibition of the huge mechanic appearing in the main part! It is! # Anigodzi" (translated via Google Translate).

The official Twitter page continued the countdown toward Anime Japan with another piece of concept art, what is the Aratrum Mothership bridge per the text in the pic. The text with reads as follows (per Google Translate) - "10 more days to AJ 2017, 10 days have passed until the new information is announced! The third countdown planning is "concept art" again. I will gradually tell you about the worldview of the movie to animation Japan little by little. Continue to look forward to the latest information on the theatrical release movie "GODZILLA"!" Hopefully we get a reveal of Godzilla soon too.

​TOKYO, JAPAN 13 March 2017 - Netflix, the world’s leading Internet television network, today announced an exciting addition to its slate, an original Japanese animation based on the Godzilla character, which will have its exclusive premiere on Netflix worldwide following a Toho theatrical release in Japan.

The first-ever high quality animation of the iconic global monster franchise is set to offer an epic re-imagining of the Godzilla world of the future.

To bring to life Godzilla’s latest adaptation, Toho is working with leading Japanese anime studio Polygon Pictures (Knights of Sidonia, BLAME!), directors Kobun Shizuno (Knights of Sidonia, Detective Conan), and Hiroyuki Seshita (AJIN: Demi-Human, BLAME!) with a screenplay from acclaimed anime writer Gen Urobuchi (Psycho-Pass, Madoka Magika).

“We’re looking forward to bringing a spectacular entertainment experience for both existing fans of Godzilla and people new to the franchise”, said Godzilla director, Kobun Shibuno. Director Hiroyuki Seshita added, “I’m thrilled to collaborate with two very talented colleagues, Mr. Gen Urobuchi and Director Kobun Shizuno to bring to life a unique vision of a universal human drama set in an epic world.” Meanwhile, screenplay writer Gen Urobuchi added, “I am very honored to join this Godzilla project as one of its Japanese creators. I’m grateful for all the support and really excited to bringing this content to fans worldwide.”

"We are truly delighted to unveil Godzilla, which is the latest addition to our growing catalogue of Netflix original anime content”, said Greg Peters, President, Netflix Japan. "Working with the best creators such as Toho in bringing Godzilla to Netflix users in over 190 countries marks a major milestone for us."

Netflix has also revealed the star-studded voice cast who will be bringing the film to life, led by Yuki Kaji (Attack on Titan, AJIN: Demi-Human), Takahiro Sakurai (AJIN: Demi-Human, BLAME!), Tomokazu Sugita (Metal Gear Solid Peace Walker, Jojo’s Bizarre Adventure), Junichi Suwabe (Nodame Cantabile, Prince of Tennis), Kana Hanazawa (BLAME!, Psycho-Pass) and Mamoru Miyano (AJIN: Demi-Human, The Seven Deadly Sins).

Godzilla is set to be the latest addition to the growing slate of Netflix original anime content exclusively available to audiences around the world. Other Netflix exclusive anime titles include AJIN: Demi-Human, Kuromukuro, Magi: Adventure of Sinbad, Blame!, Gantz: O, Little Witch Academia, Cyborg 009 Call of Justice and Perfect Bones.

Another Godzilla Anime pic has surfaced, this one seems to be an early concept pic from the translation of the post from the official Twitter page. He is the (Google Translate) translation: "Today I will show you the initial image rough sketch. It is what the production designer of this work, who served as art director in numerous masterpieces, painted at the beginning of the project. #Anigodzi" (Japanese text-【AJ2017まであと20日】「AnimeJapan 2017」REDステージ（3/26）に『GODZILLA』は登場！ 本日は初期イメージラフスケッチをお見せします。数々の名作で美術監督を務めてきた本作のプロダクションデザイナーが企画初期に描いたものです。#anigodzi). Hopefully we get a full reveal at Anime Japan March 26 & 27.