Sasuke's in way over his head with this, he will face the only man more powerful than Killer-Bee in the Hidden Cloud. We all know what happened when Sasuke went up against Killer-Bee, he got beaten and tricked...and furthermore, even though Sasuke's chakra is colder and darker than usual, his skills will probably not compare to the Raikage's.
If the Raikage is killed however, Killer-Bee will get news of this...Masashi may be setting up Raikage's death as cause for the next great Ninja War and Killer-Bee's invasion of Konoha.
Tobi will piss off Naruto and will begin to fight against him and his team, resulting in the death of one and the maiming of another. There are yet more characters to come into play during this battle as Sakura, Sai, and possibly Shikamaru are going to the Land of Iron to find Naruto and discuss this matter involving Sasuke with him.
One thing is for sure, Sasuke will begin to lose and use his trump card, The Mangekyou Sharingan.
Sasuke has made his first kill, Itachi was eaten away by disease and died of Chakra exaughstion after sealing away Orochimaru, whom had been absorbed into Sasuke's body instead of the latter. Sasuke has made his full propulsion into the darkness, and as to how Naruto will save him...is up to Kishimoto himself.
Please discuss this post of mine, I think this may very well be an accurate prediction of 461 onwards. I have used Interview references, I'm sure we all know which one by now. Give me some feedback, please?