It looks like the Playstation 4 will be doing more than play games and sharing gameplay videos. Users will be able to issue navigational commands via voice as well as be able to recognize your ugly mug all via the Playstation Camera. There’s a demo clip at the bottom from GameStop Expo 2013. The clip is a bit off the cuff but gets the point across.
One thing that comes to mind is whether the PS Camera will also exploit user privacy, but that’s for another article entirely. For now use this demo to make an informed decision.