Eh... you can wait, but I can honestly tell you, that even though the XBOX vid card was specially made the game just WILL NOT look as good as on a PC. It's a matter of dated hardware. There's no doubt it will look good, the XBOX is a good console, and I love mine, but honestly I cant justify spending money on a game for the XBOX that is out on the PC that will in every way shape and form not quite live up to it's PC counterpart. If there is a game like this out, I always go for the PC version.
I dont know if any screenies are out from the XBOX version yet, but I'd like to try to find some and check out a comparison between the two. We can all argue all day about this until we are blue in the face, and I hate argueing. We have to all understand though that there IS a hardware difference between and XBOX and a PC. Denying that a XBOX is inferior to a PC is kind of... kind of like lieing to yourself.