This is what I think will happen...
I think that once Anakin starts to turn more and more to the dark side, he and Pandeme(sp?) will become more and more distant, you know have marital probelms. SHe will naturally turn to someone she trusts and knows well...OB1! Anakin thinks they are having an affair and the Emperor will probably use this to add fuel to the fire of Anakin, causing his further turn to the darkside and hatred of OB1. He will turn and OB1 will face him in the infamous duel! Whether its over a lava pit or some sort of furnace, or whatever. Anakin is burned/injured so badly that it requries that he wear a suit to help him breath/live and of course a mask and helmet to hide his hedious face! What do you think of my idea?