@Bas: in some areas, reality is already surpassing that vision: MSR recently demoed live English to Chinese translation (with voice matching, sort of), which is more advanced than what the two little girls are doing at the beginning. And the amazing sensors that are cropping up (Kinect, Leap motion) mean remotes are on their way out, stylish or otherwise.
Of course there's a lot of technology in there that we may never see (apparently they don't need cables or batteries, for instance, signs appear in thin air and screens are so cheap you can slap one on a coffee mug), but we are getting there.
On a side note: there's a lot of "Metro done right" in the video, which seems to validate where Microsoft is heading. On the other hand, it proves that Metro looks just gorgeous on glass (hint hint).