Looks like the update for MSAA for GearVR is in 4.9 now if anyone wants to test and report back:
https://github.com/EpicGames/UnrealEngine/commit/3a68d053b909a7e29b57848f91f379dda5c9df60
This means that we can run on Android 4.x or 5.x on all GearVR phones now with the same binary, right?