One of us, Bino, did try the master branch a couple of weeks ago and you can read his thread about it on the Oculus forum. In that thread, Brian Hook of Oculus stated that the upcoming integration with UE 4.8 will be for Windows and Xaudio2 only, not the GearVR. This was recently confirmed by Epic’s lead audio dev McLeran, when he explained the reason for it being PC only. At this time, the only way to get Oculus positional audio working on the GearVR in UE4 is by running it within FMOD Studio, the process for which is detailed in that thread on the Oculus forum and in the FMOD Support FAQ.