https://www.metalgear35th.com/

Might just be some kind of retrospective, but I suppose it could also be that Konami might be working on a new project; since V we've had the Survive spin-off, the slot machine, a movie that seems to be in perpetual development hell, and some merchandise but the franchise has otherwise been very dormant, despite their being some gaps in the lore that could easily be worked into a game (The Boss during World War II; Big Boss's split from the patriots, the gap between MGSV and the original game; Solid Snake's adventures between I and II, and II and IV etc, or of course, remakes or remasters of the more dated older games).