Kept you waiting, huh....(Sorry couldn't resist).
Announced at the Playstation showcase. A lot of the details are unclear (Kojima? Voice cast? etc.) but given the trailer's focus on Jungle fauna it's obvious the game's key survival mechanic will be intact.
Also a port of the first three (Unremade, presumabely) Solid games to PS5, "The Master collection"; it's Vol.1 so presumably a Volume 2 will include IV, V and perhaps the PSP and MSX games. Maybe Rising too.