This looks pretty cool:
http://www.9to5mac.com/70139/wow-windows-8-is-tiled-and-touch-video/There's a pretty big hiccup between their touch interface and their standard interface at the moment - it doesn't look as deeply integrated all the way through as I think it could be. But one really interesting thing is the lack of scroll bars, and the reversed scrolling when they show up. This was a big hullabaloo when people first started seeing this in Lion (OS-X 10.7) but I think it's spot on. And given Windows is pushing the touch interface every bit as hard I think it's appropriate.
A big question to me is, just how "touch" will all these new OSs be? Apple has an interesting patent on an iMac looking machine that kind of reclines into a position under your hands, but I don't know what everyone else is going to do (and there's no indication at the moment that Apple is doing anything different either). I've sat and played with a couple touch computers at the local hardware store and I do not like it. It feels awkward, stupid and uncomfortable to leave the keyboard/mouse area of my desk to point at a screen and do something that I could have done with my mouse or track pad more easily. It's perfect on tablets and phones, but I don't see how the existing desktop structure will make touch attractive.
All that said, it's nice to see what the Windows boys are thinking about with their new OS. The large icon tiles that can change data are obviously reminiscent of the main screen on Windows phones - that's actually a pretty cool feature.