Now this is suprising:
http://www.1up.com/do/previewPage?pager.offset=1&cId=3142747
Hollenshead has said that the Xbox 360 version is using all of the same assets as the PC version, but running at a slightly lower poly count.
There are stories of new software builds and actual chips to install into the machine being sent directly to developers. While nobody around the show was willing to go on record, word has it that the development of the Xbox 360 is advancing at a breakneck pace. Raffel laughs, "It looks like the hardware vendors are dealing with the kind of insane crunches software developers have been."
http://www.1up.com/do/previewPage?pager.offset=1&cId=3142747