Interesting "pre-ad". They'll need to show off more of the features before the phones actually hit the stores.
Engadget summed it up will in their coverage, they are nice phones, but nothing special. Still a bit behind the best from Apple and the Android camp.
The question is going to be can they bridge the gaps between WP7 and iOS / Android faster than iOS / Android can open new gaps.
What I do like about it from a marketing stand point is that the UI isn't a bunch of icons, they've at least tried to do something different which I think is to be commended.