Here are some of my predictions and hopefully at least one comes true!
1) Orochimaru may come back reincarnated. But this this time he will have his arms back so he can be kick-butt.
2) Kabuto's trump card must be something equal to or greater than Itachi. It can't be the First, Second, Third, or Fourth Hokage due to the reaper seal death jutsu. Maybe Shisui but I don't think that's possible because it would be a pain to find some part of his real body. Possibly Danzo but that depends on how well Kabuto planned his attack.
3) Sound Five! That would be so cool if all of them were there because I love them! But Kimimaro is there so that's good enough. I want to see Chiyo and Kimimaro vs. Naruto and Killer Bee.
4) The Tsuchikage will most likely die in this war.
5) Team 7 will be reunited on the battlefield, without a doubt. And Sakura will die as a result of it.
6) Madara will try to take Naruto away from the battle between him and Sasuke. It will rage Sasuke thus the Ten Tailed creature will destroy everything and Sasuke will end up saving Naruto. They attack Madara together but both will die in the process along with Madara.