Jakks Pacific Godzilla: King Of The Monsters figures have been revealed, at least some. A large 20 inch long Godzilla, as well as two 6 inch figures, Rodan and King Ghidorah each including a few accessories. Also revealed were two battle sets Godzilla and Ghidorah, Godzilla (emissions version) and Rodan, and Godzilla and Mothra (spoilers) all include scenery in the package. A giant size version of Godzilla will be available as well standing over 40 inches tall (note this maybe the same as the 2014 version based on the pics). Jakks will also have a Godzilla mask with sound (bottom). All should be available May 2019, prices on the source site was UK dollars US prices may differ. It is unclear if there will be a smaller 6 inch Godzilla or Mothra will also be available from Jakks (possibly second assortment). Source Animegami website. 
Update: the Godzilla and Mothra set is considered a spoiler (files below are pics).

Listings:
Godzilla 12″ Tall Figure
Officially licensed “Godzilla” action figure. From head to toe he stands 30 cm tall, but head to the tip of the tail this figure is a whopping 51 cm long. Godzilla has several points of articulation.

Godzilla Giant Size 24″ Tall Figure
This is the largest Godzilla figure to date. From head to toe he stands 61 cm tall, but head to the tip of the tail this figure is a whopping 109 cm long. Godzilla has 10 points of articulation.

Monster Matchups 3.5″ Tall 2-Packs
Assortment of 8 packs, each containing two action figures and a backdrop diorama. Each figure stands approx. 9 cm tall. Window box packaging.
Content (case pack):
– 3x Godzilla & Rodan
– 2x Fire Godzilla & Mothra 
– 3x King Ghidorah & Godzilla

Monster Packs 6″ Figures
Assortment of 4 action figures. Each figure stands approx. 15 cm tall and comes with diorama accessories in a window box.
Content (case pack):
– 2x Rodan
– 2x King Ghidorah

Godzilla Electronic Role Play Mask
Officially licensed Godzilla mask with sound effects.

Tamashii/Bandai has officially updated their site with pics and info for both Godzilla 2019 and King Ghidorah from Godzilla: King Of The Monsters. Godzilla is 16cm tall and comes with a ray effect and effect joint (possibly for pose shooting it straight up). it will retail for 7,200 yen (approx $65 US). Ghidorah stands 25cm tall and has a 60cm wingspan, it comes with a stage set (struts to hold wings), and it will retail for 18,360 yen (approx $166 US). Godzilla is scheduled for release May 2019, Ghidorah June 2019, both can be pre-ordered now, there is no word yet on Rodan or Mothra but they should be available to pre-order soon.

NECA has officially solicited two of the monsters for Godzilla: King Of The Monsters, Godzilla 12" Head To Tail and Mothra 7". No images were shown yet but descriptions were. Godzilla scheduled release date is March 2019, Mothra April 2019, and retail price of approx $27.99, there was no word on the other two monsters yet. Check out the descriptions below, we will update with images once available.

Godzilla – 12″ Head-to-Tail Action Figure – Godzilla (2019)
NECA is thrilled to present its first figure from the upcoming, hotly anticipated Godzilla: King of the Monsters movie!
Based on the monster’s on-screen appearance in this sequel to the 2014 Godzilla movie, the all-new Godzilla is fully poseable, with over 25 points of articulation. Images will be available closer to the movie release date.

Godzilla – 7” Scale Action Figure – Mothra (2019)
NECA is thrilled to present its second figure from the upcoming, hotly anticipated Godzilla: King of the Monsters movie!
Based on the monster’s on-screen appearance in this sequel to the 2014 Godzilla movie, Mothra features articulated wings and includes a display base with support rod for simulated in-air poses. Images will be available closer to the movie release date.

Bandai revealed their S.H. MonsterArts Godzilla: King Of The Monsters figures at Tokyo Comic Con. This was a bit of a surprise to us cause we got no other full reveals at the stage presentation with Michael Dougherty, just another teaser trailer and production stills. The four figures give us a good look at the monsters for the first time. Godzilla is updated over the 2014 version, slightly different back fins and feet among other minor changes. Ghidorah looks very similar to past incarnations, a little thinner, more lean with many minor differences. Rodan, which we got the best view of in the first trailer, looks as expected, although it was hard to truly make out most details because of his darker coloring. Mothra is the one they changed the most, while it's wings have a familiar look and coloring, the body is much more insect like with long legs that remind us of Muto legs. Some details are hard to make out because these are articulated figures, with joints affecting the look. No release dates were announced yet but these should be released next year (there is a date of 1/19/2019 on the Tamashii King Of The Monsters page, pre-order date?). More info as we get it.

Warner Bros. Consumer Products featured both Godzilla: KOTM and Rampage at the Lisensing Expo 2017, they were featured as part of their portfolio though no actual products or marketing were shown yet (it may be simply to far out). Below is the press release info on the two films, more as we get it.
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Following the global success of 2014’s Godzilla and the acclaimed return of King Kong in Kong: Skull Island earlier this year, Warner Bros. Pictures and Legendary Pictures deliver the next unmissable chapter of their MonsterVerse with the highly-anticipated Godzilla 2.
Directed by Michael Dougherty (Krampus), starring Vera Farmiga (The Conjuring), Kyle Chandler (Friday Night Lights) and Millie Bobby Brown (Stranger Things), this epic cinematic event unites the larger-than-life icon and global fan-favorite with some of the most renowned giant beasts in popular culture. When the King of the Monsters comes stomping back to screens in March 2019, WBCP, together with Warner Bros. Pictures and Legendary, will continue the action and adventure through its exciting product offerings for fans.
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Global megastar Dwayne Johnson headlines New Line Cinema’s action adventure Rampage, as a primatologist who shares an unshakable bond with an extraordinary silverback gorilla who has been in his care since birth.  But when a rogue genetic experiment gone awry transforms this gentle ape into a raging monster, it’s soon discovered there are other similarly altered alpha predators. As these newly created monsters tear across North America, destroying everything in their path, he fights his way through an ever-changing battlefield to halt a global catastrophe and save the fearsome creature that was once his friend.  Rampage charges into theaters April 20, 2018, and WBCP will bring these creatures to fans through collectibles, action figures, apparel and more.