The PS4 Eye

What's really grabbing though is the development of the PlayStation 4 Eye, a newly developed camera system that utilizes two high-sensitivity camera equipped with wide-angle lenses and 85-degree diagonal angle views.
Sony said the cameras (amounting to 1280 x 800 pixels) can cut out the image of a player from the background or differentiate between players in the background and foreground, enhancing game play handily. There's also mention of logging in using facial recognition and using voice and body movements to play games "more intuitively."
If you want to know how these specs stack up against what we know so far about the Xbox One (clue: PS4 is more powerful) - check out our comparison of PS4 and Xbox One specs.