Whatever it is, it better be some powerful trump card. Taking on Itachi and Sasuke at the same time, well, you´d have to be series end villain material to manage that. Though I kinda find it bs that Itachi and Sasuke are teaming up. It´s just not believable.

Anyway, I wonder what Kishimoto is going for here. Obviously, Sasuke isn´t going to die. Zombie-Madara should be unbeatable now that he created a bunch of clones that are 100% copies of himself, capable of all his jutsu and having infinite chakra. Fake-Madara, however, won´t be defeated since he´s the main villain. So, as I see it: Itachi "kills" Kabuto, which cancels Edo Tensei, thus saving the Kages and ending the fight between Fake-Madara and Naruto/Kakashi/Gai. That leaves only one event: Fake-Madara awakening the Juubi, be it with or without the inclusion of the Kyuubi. And then we´re about to see the end of this manga.

Which, if I´m right, sucks, because I really don´t want to see Kabuto go down against a stupid zombie-Itachi. I still have hopes that somehow Orochimaru returns :/