Harley Quinn is attached to Joker’s gang so i doubt we’ll see her..unless she breaks out her old boss from prison.
Yea that is a problem. I don’t think anyone else could come close to playing Joker like Ledger did so can’t bring Joker back just to work in Harley.
Unless they her somehow to work a storyline that doesn’t actually involve Joker on the screen, except maybe seen only in shadows so as not to degrade Ledger’s performance.