Windows Phone 7 Series promotional video
That phone in the video looks like an HTC HD2, but we are not 100% sure. At WMC they had a few HD2 running Windows Phone 7 Series and in a few scenes of this video ad when the kid is playing games and the dad siting on the couch both show an very similar device to HTC HD2.
Tags:couch, HD2, HTC, HTC HD, HTC HD2, Phone, playing games, video, Windows, Windows Phone, Windows Phone 7, Windows Phone 7 Series, WMC