Let's wait and see. Keep in mind, the video is pretty frenetically cut. The video is designed to provoke awe, but I suspect the interface is less "out there" in practice.
The only functional problem with windows 8 metro I find is it's exclusiveness. I think windows 8 has a terrific UI for an application, just not for an OS. Give me windows 7 desktop where on the press of the windows key I get a windows 8 metro overlay like steam/xbox 360/ps3/etc, and I'd probably love it.
