It seems to me more likely naruto 693 that Sasuke will simply be shown to have realized he was wrong and he will not seek that path any more. That leaves nothing but wrapping up the loose ends. The other option is that Sauske has to be forced to realize he is wrong in a fight with Naruto. The tinder-box of such a fight would very likely be the question of what is to be done with the Tailed Beasts. Sauske obviously sees the Bijju as part of the “system” he wants to replace. Will he give up on that?
And Orochimaru… They’ve got to say something about Orochimaru before everything is all said and done. His ambitions can hardly be just to see what Sauske wants to do. Before he wanted to be immortal and to know all jutsu. So once he is out of the God Tree is he just going to shrug and slither off into the sunset? That would be a singularly unsatisfying end to him. We still don’t even know what happened that turned him against Konoha in the first place, really.Still hung up on the past? Even though we’ve been seeing Sasuke changing for the better? Not shocked, to be honest, as that’s all anyone really has now. “But Sasuke was evil three arcs ago! He tried to kill Naruto five arcs ago! I’m gonna pretend Sasuke said he’d kill anyone who gets in his way of peace even if they are good people, like Naruto, even though this was at the start of the fight and Sasuke seems to be less of a ‘my way or highway’ kind of guy!”
Eh, I hope Orochimaru goes back to being evil. He was the best evil, ignoring his performance in Part II.