This is not going to happen. Sony probably has some sort of exclusivity contract with Square that at a minimum will keep this PS3 exclusive for a certain period of time, but really the chances of it ever coming to the 360 are very slim. If Sony did lose this it would be huge, probably bigger than if they lost MGS4 (there's a better chance of that one coming to the 360, though I wouldn't call that a good chance). And Square of all companies is resistant to the multiplatform rout. My guess why is that companies, particularly SOny, will give them a lot of money to make sure their big titles will only come out on their system.