Joystiq interviews MGS4's Ryan Payton: Seems it's staying PS3 exlcusive

[Mummelmann]

Konami are fiercely loyal to Sony, since the very first Metal Gear on Snes or Nes, they've grown into what they are today because of PS and PS2.
However, should PS3 sales remain low to mediocre (which I'm sure they won't!), Konami will have to take action.