I'm very excited for the second and third generation oculus rift, or whatever succeeds it. If I can get something with a sunglasses form factor and a front facing camera with "pass through" mode, I'd just wear it all day (while working). For me, the killer app is a virtual desktop where I can arrange a wall of windows around my laptop. I don't own any furniture and tend to bounce around furnished apartments, so being able to have a replacement for multiple 27" monitors that I can fit in my laptop case would be a godsend.

Edit: as long as it has vim bindings. :)