Sasuke is probaly gonna kill Madara or something... i mean who else are they gonna kill? Sasuke's whole REASON of living turned out to be the reason he's ALIVE. Itatchi actually loved him and did so much stuff for sasuke and sasuke didn't even realize it the whole time. I think itatchi was obviously preparing him for something though... I mean he got him to get power, (according to madara) i think he got his own mangekyou sharingan, and he has itatchi's.Itatchi even took away orochimaru's curse. Probaly gonna either be a whole Naruto - Sasuke epic battle where Naruto goes crazy in the end of the fight and the nine tails comes out completely and sasuke has to like control it or something with his sharingan and it'll probaly be a happy ending since it's like rated for 7 year olds where sasuke saves his BFF and they all live happily ever after.