I like that they used Linux for the demo. That means they probably have a window manager ready to go (i.e., I won't have to wait for Microsoft to adopt it). When it comes out, all I'll have to do is "emerge 10-gui" (oh, and buy the hardware) to try it out.
Speaking of which, the hardware had better not be too expensive. That would kill it.
I don't think I like their linear window management idea. I like that I can arrange windows to overlap on a 2D space, and access them with a single click, or Alt+Tab in 1-D fashion. It seems better to me than manually scrolling through all my open windows.
Oh, and attaching the touch surface to the place where I rest my wrists to type? No. Just no. That's the dumbest idea ever.