The new kinect isn't just for games now, it can recognize when YOU are in the room and have all your settings ready to go. It's mostly going to be used for that, and voice controls like switching from TV to game just by saying it. It can also be used for controlling your tv. I personally think the xbox will be more for adult gamers then kids because of the direction they took.
If I were a kid I wouldn't care about the whole "all in one" aspect it has and would prob just want the PS4. When it comes down to it they are pretty much the same as far as gaming is concerned, the only real difference is the extra features the xbox has. It's not just for gaming anymore..