Chances are he has a deal in place for Bogut. He knows he has to improve his rebounding and D up front to have any shot in the playoffs. Any other major deals are conjecture at this point.
I think he should pull the trigger on George or Butler if they become available. But he has to be the proactive one. Those guys have solid contracts, and there isn't much push to trade them.
You have to make them an offer they can't refuse.