For some reason I'm not quite as hyped about VR/AR as other people are. Maybe it's because we've seen bits and pieces of the technology over the years, and quite frankly people greatly overestimate their willingness to flail their arms and hands around to perform gestures.
The HoloLens thing looks neat and all, though I'd imagine it has more practical application rather than gaming. A bunch of the things people are saying here have been said before about Oculus, with the only difference here being now that you can see past the lenses and into the real world.
I'm very interested in input devices that reduce the amount of motion/effort on the user, things like detecting brain waves or eye motion. I remember seeing a few input devices that track individual finger movements, which I think would be absolutely crucial in conjunction with AR/VR to work as effectively as it could.