We have just got a oculus rift dk2. It works fine. Test apps I have downloaded worked fine. Anything we build however will not render to the oculus device. It renders like a normal unity app. It head tracks though.
This is using Unity 5.1.2f1 Free and the Oculus Utilities for Unity V0.1.0.
In player settings the Graphic APIs for windows is Direct3d11 and Virtual Reality Supported is turned on.
I have tried building both my own scene, a new scene and the OVR included scenes and this still happens.