The bulls have a lot of bench spots to fill, Marco Belinelli, Nate Robinson, Nazr Mohammed, and Rip Hamilton has a $5 mil team option that I doubt will be picked up. (Daequan Cook and Vladimir Radmanovic are also free agents). However these free agents don't actually clear up much cap room because Taj Gibson's new contract comes into effect.
I hope the Bulls consider picking up CJ Watson again, who is a free agent.
Any moves regarding the Bulls look like they will have to come from cap exception signings or trades. They won't have cap room until next year with Deng's expiring contract and the possibility of amnestying Boozer (Which I doubt would happen this year, but could, but probably will happen next year).