Xen on 15 April 2009
"Kojima explained that he was never tied to an exclusive platform, but felt that the original Metal Gear Solid matched the PlayStation 1's technology and demographic. As far as the future is concerned, Kojima thinks that depending on the title he'll "have to decide whether it's exclusive or to go multiplatform. I'm really flexible on that and it's more about the project itself.""
http://www.gamezine.co.uk/news/game-types/shooter/kojima-flexible-on-multiplatform-not-100-satisfied-with-mgs4-sales-$1283549.htm
Don't be so sure about exclusivity. I'd hope it's only PS3 though.
