Did you watched this video? If not, go there, I wait.
Many of these technologies that show up from time to time with all those grandiose ideas, talking about how suddenly our lives will never be the same, end up being just nothing. Or it is so for the next 20 years. Looking the video, reading the info and impressions of those who tested the thing (here 1, here 2), I don't think this is the case.
The video doesn't show quite well, but the device not only works with augmented reality, projecting objects and virtual imagens on top of the environment, it also has cameras tracking the movements of the user, microphones and the ability to connect to other devices around to work together. With all that it is possible to use your hand to interact with what you see, voice commands and data transfer related tasks.
I think the opportunities of entertainment are very interesting, but the main point here is the possibility to truly creacte something that can be a new tool do everyday work, to scientific development and many more.
The HoloLens have no release date, but it will be interesting to see how all this potential will be developed, or not (right, Microsoft?).