I didn't see, or expect much friction on these rumours on the Mix site, but I was pretty encouraged to start developing for Windows Phone 7 Series and about the Metro design principles after watching sessions like CL4. I'm not alone it would seem, despite some naysayers.
The principles and guide are reassuring on intent (e.g. celebration of type) common design (e.g. data relevance) and interface (e.g. common gestures)
A great question by an attendee on panoramic (or scaled up ) displays - stating Metro came from design in Media Center!