According to Patrick it runs "pretty damn fast" but Software Update won't recognize it so you won't be able to patch. System Profiler thinks that it's a Mac Pro. Listen to the fan, it sounds like a 747 taking off.
Don't bother clicking the play button above I can't embed the video, so it's just screen grab. Jump over to Gizmodo to check it out. They're promising more pics soon.
In related news: Psystar called me today to tell me that the default white case is backordered 10 days, so I switched to black which is in stock. They told me that mine would ship this week, hopefully "in a couple of days."