The game was originally and PS3 exclusive, but Sony dropped the ball on that one and now it's coming out on XBox 360, PC and also PS3.

The console versions are supposed to be out in November this year, while the PC version is due out in January 2008.

No details on the PC specs required to run the game yet. I imagine that they will add more detailed environments higher resolutions to it, as others have done to console ported games. Gears of War for PC being one example.