The Hololens is Microsoft’s enterprise Mixed Reality Headset. Along with it comes developer tools and experiences used for instructional uses and more.
Microsoft provides the Mixed Reality Tool Kit (MRTK) which is a set of tools and components for building MR applications on the Windows Mixed Reality platform. It supports both Unity and Unreal Engine, providing a framework for creating immersive mixed reality experiences.
It is worth taking a read through the features offered throught the MRTK as it is a good reference for the affordances that current MR technologies could possibly offer in other headsets as well.
MRTK2-Unity Developer Documentation - MRTK 2
See news in the Future tab in this wiki on the Hololens and it’s development.