Interesting things the ps4 could theoretically do
http://kotaku.com/the-ps4s-camera-can-do-some-cool-tricks-461245527
"It'll theoretically allow face-based logins, let the game identify who is talking based on their voice, have characters in the game look out of the TV at the person controlling them (cool), or have the game automatically re-orient multiplayer splitscreen if the players wind up moving around the room mid-session. All little things, but all nifty."