For this to be useful, of course, he needs to make predictions about relativistic effects on quantum scale.

I've wondered about the "spooky action at a distance" thing, because it says that as soon as you measure one particle, the other particle is in the same state, instantly. But GR rejects any notion of "now", ie an external chronological reference frame, as being invalid/nonsensical. It ought to be possible to do experiments involving spooky-distance-action and things travelling Quite Fast (in orbit would do), to see if there is an external chronology or whatever.