Looks interesting and it's probably MGS5. I know the prosthetic hand and other things don't make sense but Kojima is trolling us all. The arm, the bandage over his face and everything else is there just so we'd talk about the game. You can also see a person who looks a lot like Volgin and some floating body that evokes the memory of Psycho Mantis instantly at the end of that trailer.
Also, there's this.
And we're all talking about it
while we argue and wonder what it is, just like the rest of the internet. Nice work, Kojima.