For the longest time I thought, wow the ZuneHD user interface is by far the best looking of any mobile device currently out there! Just perfect.
aaaahhh... Today we got good news! Microsoft brings the Zune UI to phones and calls it Windows Phone 7 Series! So the next months I'm looking forward to Sony Ericsson's announcements for matching Xperia hardware in Q4 2010. I just really really hope they'll pack a decent camera with xenon flash into the thing - hdmi out for 720p vid is also very high on my wish list.
The main hardware buttons will be reduced to three: home, search and back - similar to how Symbian and Android phones work these days.
Allthough Ballmer has no objections to Adobe flash, the first release of Windows Phone 7 won't come with flash support. As does Win7, the OS itself supports multitouch for up to 4 fingers.
At the moment the videos are enough for me. If you feel like wanting to read more about the OS, I suggest this good read @ pcworld / oder auf Deutsch gibt's natürlich bei heise was zu lesen. Here's also a short introduction to the next symbian^3 > quite good looking as well.