I think Dwight won't sign an extension with Orlando,they might trade him but definitely not for crap like Bynum, they'll shoot higher than that.
I think he Nets will try to attract him if Dwight becomes a FA, they won't have enough assets to get him via trade especially if they get Melo, but Melo and NYC might be enough for Dwight to sign with them, he stays in the East,competes against the Knicks and rebuilding Boston, unless we were able to get him to come play alongside Rondo.