See the full presentation @ https://www.youtube.com/watch?v=IPmAwvmOXKM
Read TheVerge with a hands-on at the press conference @ http://www.theverge.com/2015/1/21/7868251/microsoft-hololens-hologram-hands-on-experience
Also read the wired hands-on article from october @ http://www.wired.com/2015/01/microsoft-hands-on/
I already see the interior decoration apps running on this one (would’t be surprise if IKEA would lash on to this and release a virtual store with virtual furniture to have tryout at home with actual measurements).
Definition from Wikipedia –