Is that all the cars? They basically took the cream of the crop from gt5 and added other really nice cars in there, like the shelby daytona, one-77, etc but they are definately missing many entire series. Still no way I'm gettin an xbox though, and physics i haven't ssen first hand
Anyway, it would be a little awkward all of the sudden letting cars be RMable, either way it's the same thing with a different technique, still a positive to me