I don't think Sasuke will seal the beast inside him, he'll control it from outside.
Naruto will learn to control the red chackra as long as he doesn't release the fox, but in case he releases it, I gues only Sasuke will be able to control it in full force.
Naruto will be able to control his anger, he has no other choice as, in order to learn nature control, he needs to be "dead" without moving. That is to say, to remain relaxed.
Pain will lose at least one body but he'll replace it.
By the time Naruto and Sasuke fight, they will end it once one of them wins, though they may arrange for it not to learn with somebody's death.
About Kabuto, he will try to kill Sasuke, he may even try to join the real Akatsuki once it becomes clear that Sasuke is working for himself.
AWESOME points...
I dont think Kabuto will resulth in joining Akatsuki... but you never know. He seemed more of a loner type.
I cant wait for Naruto to learn and start using his 9 tails chakar with out losing it and turning into the demon fox.... other wise it will all go to waste. its like creating a universe with only having life on one planet... what a waste of existence...
PLEASE KISH MAKE NARUTO learn to control the 9 tails chakar but not rely on it...