Yes, and I've received word that as there wasn't any new functionality in the new mobile SDK, it was a deliberate on our part not to include it. The new VRDiver implements the same API as before.
That's odd to hear, because this is new functionality in 1.0.4 per release notes https://developer3.oculus.com/documentation/mobilesdk/latest/concepts/release/ :
Long-press back button handling (including gaze timer rendering) and recenter-on-mount are now detected and handled directly by VrApi. Applications should no longer implement this logic.
The VrApi Loader is now Java free, further reducing the number of dependencies an application is required to link against.
Gaze Cursor Timer is now rendered automatically in VrApi as a TimeWarp Layer.
Back-button long press handling and recenter-on-mount are now handled directly by VrApi. Apps should not implement this logic any longer.