I felt compelled to share this, it's been my little holiday project and I've made pretty good progress.
Basically, I glued together a number of bits of other peoples work, and wrapped it all in the OVR Mobile SDK and then added some more functionality to make things like menus and the status bar VR friendly.
So far there's no sound (haven't got that working yet), however there is proper stereo projection, the head tracking is as smooth and low latency as you expect from a true Gear VR app, and it has full controller support (I use a Moga Pro).
I don't imagine this will be approved for the official Gear VR store, so I will probably talk to /u/skyworxx about putting it on the SideloadVR site once I have finished it off.
