For you guys who are making fun of it as a TV watching system, don't be surprised if some top notch TV Series and programs are provided on the Xbox One first, before hitting HBO or any other network for the sheer amount of information they can capture in piloting shows on the xbox.
They can track heart beat and facial expression data, that's insanely powerful stuff for big networks investing all that money into their programs. They are going to have studies on your reactions to targeted TV commercials, etc. You sign an agreement for free content or a discount on a game, and boom MS starts selling off your facial expressions during programming. Stuff is going to be worth fortunes.