This chapter was amazing, even though granted - Naruto being the super hero was a bit much. Also, I'm surprised Kakashi still manages to stand, seeing as he's often portrayed as a weak shinobi in Shippuuden. Anyhoe - as for Madara being resurrected. Wasn't a huge surprise.
I'm not sure about Tobi, though. With his little 'fight' with Danzo, Danzo (or one of his men) manages to cut Tobi's arm or wound it badly, so badly that Tobi throws his arm away (he cuts it off or rips it off). He doesn't re-attach it at the moment or let it grow back or w/e. This makes me realize that he has somewhat of a 1st Hokage / Zetsu DNA, or has someone with medical knowledge help him.
Also, its still plausible that it might be Izuna or Obito - both weren't seen dying. This gives Kishimoto great opportunity - he can do anything.
Obito's left side was crushed, yes, but you didn't actually see him die. As for his left side being paralyzed/ crushed, that's the exact side he showed Sasuke after his battle with Itachi. It would make sense that Rin, as an example, could assist him with medical knowledge. Anyhoe, it wouldn't make sense as the side was intact, but remember - Orochimaru had the ability to also heal himself and went through hosts. Who knows Tobi goes through several Uchiha's (who were taken from when Itachi killed them). Then again, Tobi has the ability to go through dimensions, he has barely fought, so this shows that Tobi isn't much of a fighter, but more the thinker who uses pawns (such as the current dead Jinchuuriki who are somehow connected to him, as their eyes are all the same).
I'm so confused right now. It could be anybody… could be even someone related to the 1st Hokage. Can't wait for more!