You're actually hoping that the Xbone version will hit 1080p, and have lighting/shadows parity with the PS4 version? I wouldn't get my hopes up. Where do you think that surfeit PS4 power goes? It just disappears, or goes ignored by the devs?
We have to remember that we're talking about a system that had severe framedrops and screen tearing running the Source Engine at 792p (Titanfall). If Sledgehammer really wants a consistent 60fps as a priority, they will run it at 720p on the Xbone, barring some nigh-miraculous optimization techniques. The highest resolution you could probably, feasibly hope for would be 900p with an inconsistent framerate.