On announcement that he was doing the new Star Wars, I immediately assumed he'd move over to that as a director, but would continue on as a producer/consultant on Star Trek 3. After all, Star Trek might still be Paramount's intelectual property, but Bad Robot are the company who are actually making them (essentially 'outside contractors', if you will). So there isn't really
any true conflict from Bad Robot being involved with both Paramount and
Disney at the same time, is there?
Like Speilberg before him, Abrams has already shown he can whip up multiple movies on extremely tight schedules. Perhaps he might even still be able to helm both?
(Unlikely, I know.)