I can see a lot of uses for AR.

- A killer feature for me would be (pedestrian) navigation. Highlight the road I have to take with a subtle color. That would even work on a very low-res display. Or at the train station, highlight the part of the train were my reserved seat is.

- If you have a higher-res screen, you could add additional information to the walls of places, like restaurant ratings etc.. Making it look just like a physical sign is key.

- One thing that is controversial, but would be huge for me, is face recognition. I sometimes have a hard time remembering what face belongs to what name. A option to show name tags for people I've seen before would be really convenient.

- How about an app that shows plans when fixing a bike or a car? Or one that tracks where you left your screws? If you have a very good camera, it might be able to even find screws you lost :-)

- Of course AR/VR games could also be a huge thing. Time will tell if that really catches on or not.