Re: Could the Joker and Bane work together?
I wouldn't have expected much more than that.
Bane was supposed to be giving people hope before he destroyed them. I could see him releasing Joker as the first act of taking away their hope, and Bruce's while he is imprisoned. Upon Bruce's return, he would be the first person he takes down, the night he rendezvous' with Gordon, leaving Bruce with another ambiguous and enigmatic speech.
Some have suggested he'd kill Bane too, but I think that would be too much.