when orochimaru was first revived by sasuke he expressed his disinterest in the war inspite of observing everything and gaining info from kabuto's knowledge....but still pointed out his actual goal which is getting sasuke's body. At that time obviously oro was in no position to do anything at his free will because sasuke was stronger than him and he had his arms sealed. But now he has his arms back, even though he has given hokages the freedom of movement, he can control them anytime he wants. And now he has a much much greater chance to get sasuke's body because he is far stronger now. Oro turning good really doesn't seem right and i'm pretty sure whatever he's planning it is real real bad and dangerous. Considering the genius he is, there is a possibility that he will later on affect the course of the war. I just hope sasuke keeps in mind about that and doesn't let his guard down.