MGS4 CONFIRMED to be coming to the Xbox 360 a year later (gametrailers)

[Omac]

Konami wouldn't tell anyone if they where developing for Xbox, untill they started selling it for PS3. That would be bad business, and would hurt the sales for PS3. I still think it's going to be ported later on, more money for Konami. Of course time will tell just like most things.