Re: They have to be joking
You do wonder what planet Microsoft seem to be living on at the moment. Humans don't have X-Ray vision and this would be a disaster for bumpy accidents... Or, you're having so much fun navigating around the 3D UI, that you bump into the door frame of your upstairs bedroom and then fall down the stairs (then die).
At least give us a transparent 3D interface! The preview video looks like it came out of a visionary late 90s company that crashed and burned.