Geoff Keighley twitter says..........

[Xxain]

Rei said:

   My money is on Kojima. But it could also be Cliff B considering these recent rumours of Epic Games' PS3 exclusive. It is unlikely that it is Nomura since it is usually Yoichi Wada who represents Square at events like E3.

   But after getting a bunch of so called "megatons" Keighley promised, this "well-known game designer" could turn out to be some absolutely unknown guy.

but would that make sense??? why would he take the stage twice to announce MGS when he can just announce it once???..if it is him he would have to have multiple games under his sleeves