I must say, that's surprisingly clean and not in-your-face. A nice change for Microsoft. I've seen very similar styles of interfaces (concepts) for a few years, but they're certainly the first big-player to back it with a product. We can hope it won't be that slow-scrolling (largely seen in other videos). People get annoyed with shiny things that slow them down.

One thing that's bugged me about the touch line of iProducts is the amount of wasted space around the icons (though I understand the reasoning behind it, and it would encourage an entire icon remake if changed).