Peter said no such thing. He seemed to find the exclusivity announcement at Sony's press conference amusing because it was in spite of the fact Konami has publicly been keeping their options open. I agree that there is no solid confirmation of MGS coming to the 360, but Konami seems to be flirting with the idea if nothing else.
J u l y 1 6 , 2 0 0 7 - Microsoft's coporate VP Peter Moore confirmed that Konami's Metal Gear Solid 4: Guns of the Patriots will not be coming to Xbox 360, the game remains as a PS3 exclusive title.
Link : http://www.the-magicbox.com/gaming.htm
GI: Is Metal Gear Solid 4 still exclusive? Is that solidified and will never appear on the Xbox 360?
Harrison: Yes. We said it was an exclusive title
Link : http://www.gameinformer.com/News/Story/200707/N07.0719.1908.25222.htm?Page=3
Its NOT!! happening