Random Idea: Kinect and Microsoft Glass Game
The screen would have a layer of fog obstructing your view. Your phone can see through it and lead you on your way.
It’s like the Wii U, just different set of technologies. http://www.youtube.com/watch?v=09apkk58Ju8Imagine playing an Alan Wake style rail shooter like this. Your phone is the flash light. Your other hand is the gun.