I've seen a lot of people stating this as an obvious fact. It's not happening. So, to turn our words into something more, I propose a bet.
I say that MGS4 will not be announced for the Xbox 360 at or before E3. With or without extra content. I define Metal Gear Solid 4 as a game with the same story as MGS4, every weapon, every cutscene, every item, starring Old Snake.
Punishment: Winner chooses loser's avatar and sig for a month. Must abide by forum rules.
Anybody want to accept? I'll say yes to whoever I think seems the most confident.