Unity Pro developers can already test the native VR support in 5.1.0.b3!
Now you can use the dk2 inside the editor. Biggest change is you only have a normal camera instead of ovr camera rig, it really makes things a lot easier! Have a look at the docs:
https://docs.google.com/document/d/1GkS ... edit?pli=1
Native VR support is now dk2 only, but other devices will follow! It is a big step in the right direction.