Tamashii has officially posted hi-res pics and info on their S.H. MonsterArts Mechagodzilla '74, the info for the most part is the same as previously posted, the figure will be 9,720 yen (approx $88 US), is 15.5 cm tall, and will be released Jan 2018. The new info is it will feature a beam effect and replacement hands and articulation that allows for multiple poses. This is a Tamashii Web Shop exclusive but may still end up available from Bluefin.
Update: Big Bad Toy Store has this figure listed at $94.99 it is unclear from their site if it is a Bluefin release or an import.