Temporal AA either won’t work on Gear VR or will cause issues. Gear VR runs with hardware MSAA x2.
Mobile HDR causes x2 fps drop, even with empty scene.
Multiview is in alpha, so it causes fps drop too.
I have S6, and yes, I have no problem running UE 4.14.3 projects on Gear VR. GLES 2.0 and nothing fancy (no HDR, no multiview, no AA). I simply followed Epic’s docs for Gear VR since 4.9 and never had any issues.
No, UE4 doesn’t support arm64 builds (or maybe it does, but build fails; I don’t recall why, maybe FMOD didn’t have arm64 libs or maybe something else). I don’t know if Oculus Mobile SDK supports it (maybe it does, but maybe their FMOD plugins don’t have arm64 builds)