Making a cameo appearance on the big screen during the Gates keynote, a future version of Windows Mobile! Maybe. It could be Windows Mobile 6.1, but it doesn't look anything like what BGR leaked awhile back. And yes, it could be just a custom skin. If that's the case, then color us impressed with HTC's customizations. If that's not the case, then either we just caught MS with their pants down or they're viral marketing geniuses (or this isn't new at all and we're the ones lacking trousers).
Take a look at the new Start Menu of listing programs / settings / etc. It looks like there's a left/right menu on top to switch between “Programs,” “Settings,” “Photos,” “Internet,” and so on, then up/down to switch between the stuff within those categories.
Full gallery after the jump!
(p.s. since we lost connectivity last night, expect our live coverage article to be updated with some photos in just a bit)