It would be nice if someone could give a helping hand bringing this positional tracking for Gear VR to UE4: http://julesthuillier.com/vrtracker/
just wait a bit… inside out positional tracking is coming …
Well, considering JC has been working on it forever and there is no end in sight, I’d say the link above is the best solution. It also doesn’t put any stress on the phone itself and would work with Note 4 too.
I think inside-out tracking will be S7-only and up.
Yeah, probably, unless maybe if we get vulcan on S6 too…, that would lessen the load on cpu & gpu, to free up time for computer vision.
The rumor has it that S6 won’t be getting Vulkan 
Just bumping it up since the progress is being made with this project: https://twitter.com/VRtracker
Note that UE4 plugin should follow next.
UPDATE: VR Tracker in action: