Not sure why they didn't call it HaloLens (given Cortana, Spartan names) - I'm going to have a hard time calling it HoloLens.
I think in 5-7 years when it becomes smaller - it will be as common as a 2nd monitor in the workplace today. I can imagine that instead of having multiple monitors - you can just 'throw' documents (doc, xls, ppt, .cs, .cpp) up on a cube wall and now you have unlimited deskspace to work in, you just turn your head/chair. If you want to share and discuss a document - you can just share it virtually. Would love to have it hooked up to a Surface tablet so that as I write on the tablet, the ink shows up in others users virtual whiteboard.
Unfortunately, DWHs (Driving While Holograming) will cause all sorts of legal issues.
Side note - which would be safer - texting while driving, talking on a phone while driving, talking via Bluetooth while driving, or wearing HaloLens (sorry, I still think you should change the name) while driving?