Don't know if it as been posted already :
http://www.shacknews.com/onearticle.x/55389
"Konami, in yet again denying rumors that Kojima Productions' Metal Gear Solid 4 (PS3) is in the works for the Xbox 360, made a quote from its PR man disappear in the night.
The persistent rumor popped up again after Konami PR rep Yoshitaka Arai told the Japanese branch of investment firm Morningstar, "we are investigating releasing a 360 version." But GameCyte picked up that Japanese game blog my game news flash noticed that the story was quietly changed."
.... some say/feel it could have been changed due to a breach in the exclusivity contract.
Evan Wells (Uncharted 2): I think the differences that you see between any two games has much more to do with the developer than whether it’s on the Xbox or PS3.
