IIRC EWR-HKG reverts to the pmCO 772 in the winter schedule, which has 2-2-2 Diamond seats and not 2-4-2 IPTE seats. Or at least that's what I'm seeing in mid-December and mid-January. I don't think the pmUA 772s (with IPTE seats) have the range to do EWR-HKG, especially in the winter.
As others say, there's a chance that the plane gets swapped out for a Polaris-equipped one at T-48h or so, but the chances of that would be fairly low, given that only a handful of pmCO 772s have been retrofitted.