There’s a lot we still don’t know after seeing this video. ((Apart from the [crappy audio](http://daringfireball.net/linked/2011/06/01/previewing-windows-8).)) What is clear is that the ‘start’ screen is a wrapper on Windows 8 and that is never a good thing.
From what I have seen thus far, this is a pretty to look at and not great to use move. That said, it sure is pretty.