Ok, it would seem a post I made earlier got lost in the forum rollback so I'll post it again.

The odds of this game ever coming out on the 360 are even more slim than they were before if you ask me. A friend of mine read in a developer interview that making a game specifically for the 360/PC and porting it to the PS3, or vice versa (we're talking something that really takes advantage of each systems hardware to the fullest here), would essentially take almost as long and cost as much, if not more, than developing it from scratch. It makes sense since each are totally different hardware architectures. You won't generally see it with current games since they don't tend to exploit the hardware they're on fully, and I doubt you'll see it on games that start out with multi-platform release in mind, but let's just think here; which game is utilizing an engine specifically designed to take advantage of the PS3?

If Square wanted to port it over to the 360, it'd be almost like starting from scratch, since the game engine itself would need a pretty big overhaul.