There's been a bit of hullabaloo over some recent UI shots linked to from I Started Something that originated from designers at the Microsoft Advanced Technology Center. ZOMG, is it Windows Mobile 7?!?!?!?!?!??!?!?! Eh, maybe. Maybe not. As Long Zheng puts it: 

What many people don’t know is that the ATC has been largely responsible for the user experience design of Windows Mobile. This however is no longer the case as WM 6.5 was their last project.

So, that's that. There's also some more clarification in the ISS post in that not all of the concepts were specifically designed with Windows Mobile in mind. And remember, folks, this is all conceptual stuff. Yes, there are design cues from some other leaked UIs that we've seen, and it's possible that we'll see some of this in a future version of Windows Mobile. But let's not be counting our chickens before they hatch just yet.