I've been waiting for them to do a game like that. I thought it'd be a neat thing to integrate crosshairs and guns into your smartphone for play.
Next, we need procedurally-generated monsters to pop up on your camera. Look through your camera for an ARG. Imagine a game like Umbrella Chronicles, except the zombies are in your house, and you have to get to a certain point in the real world to complete the level =)
Back from the dead, I'm afraid.