Microsoft made announcements of Windows10 at the keynote, but along with that they did introduced Hololens which uses Windows10.
Hololens allows you to work with 3G holographs, using augmented reality.
The virtual holograph is only visible to the user who is wearing that HoloLens while working and Microsoft demonstrated it on the stage in real-time using a specially build camera of rendering the HoloLens view on the screen.
Microsoft has shared 2 videos showing the use and possibilities of HoloLens for the real world.
https://www.youtube.com/watch?v=aAKfdeOX3-o
