This rumor popped up last week about Colin Trevorrow. He reportedly met with Lucas, who is a big fan of 'Safety Not Gauranteed', several months ago.
His comment in a recent interview is interesting:
"It is not something that I can comment too much on. But I can definitely say, I am as much of a fan of Star Wars as everyone else for whom Star Wars was the most important thing in their life, when they were a kid. I'm deeply aware of how profoundly important it is, to billions of people. It really is a mythology and possibly even a belief system for a lot of people. I certainly can't comment on what my involvement may ever be, I can definitely say that I would absolutely love to direct a "Star Wars" film at some point in my life. That would be incredible, I'm not daunted by it. Even if I understand that any thinking director who cares about it as I do, as much as a lot of directors do, would be afraid of screwing it up. But I also think that it's a risk that a lot of directors would be willing to take, because they care about it so much."
http://screenrant.com/star-wars-episode-7-colin-trevorrow-director-boba-fett/