Whoa.....I think I get where the whole blast from the past arc is going.......and if I'm right.....it'll be epicly awesome!! But on another note, I hope you don't have Sasuke come springing back stronger than ever after receiving, an admittedly, not full powered Rasenshuriken, and not having any physical consequences. The reason is I don't see even Tsunade to be able to completely heal that kind of cellular damage, so there should at least be some kind of handicap, Perhaps do something to make it difficult to channel chakra for techniques anywhere but his eyes as a result of the damage to hos chakra network. Of course these suggestions are made under the assumption that you will keep him alive.
Either way, great chapter.