The video is a bit corporate at the start but worth a watch as it goes into the possibilities of what the hololens can do. Just putting a display on everything or having it float in air is brilliant.
We envisioned a world where technology could become more personal—where it could adapt to the natural ways we communicate, learn, and create. Where our digital lives would seamlessly connect with real life. The result is the world’s most advanced holographic computing platform, enabled by Windows 10. For the first time ever, Microsoft HoloLens brings high-definition holograms to life in your world, where they integrate with your physical places, spaces, and things. Holograms will improve the way you do things every day, and enable you to do things you’ve never done before.