He's going to LA, Chicago or Phoenix (major darkhorse).
If he goes to Chicago, he's basically tying his future to Derrick Rose's knees, because Chicago has to amnesty Boozer and give Gibson away for nothing. Then they have to rebuild their front court. I don't see how that's gonna work.
If he signs with Phoenix, they'd have a starting lineup of: Bledsoe, Dragic, Melo, Frye and Plumlee with Green, the Morris twins and Tucker off the bench. They have like four first round picks in the draft too that they could probably package for another star player if they wanted. That's a lot of firepower.
Edit: Dallas would be an attractive option too.