The new tweets are just Kojima saying that they've revealed more information about the avatar creation process, how Monolithsoft is nervous about their first user-created main character, lots of voice options, etc. PR shit.
The new gallery showcase is from Yoko Tsukamoto. She's doing character and enemy designs, and the main illustration being showcased is a character illustration which includes the "Roo" character which she designed.
Ah, thanks a bunch. Gonna update the OP in a few minutes.
Is there any relevant info from the website? Other than the list of VA for the MC that StreetsAhead already translated.