If you look at the old Whistler Beta (WinXP), you'll see the interface changed between then and the final release.
What I'm trying to say is, those of you who say it looks like XP, that could still change. (I hope it does, I agree it looks too much like XP, what happened to that 1337 sidebar with the clock on it?)
Master of common sense. If you don't like it, stop reading.