Well, I do doubt that Sasuke wanted to hand over his body. But I do know that Sasuke wanted to the power needed to defeat Itachi. I think Orochimaru knew Sasuke's betrayal was coming, and I think Sasuke knew the best time to go for the kill would be when Orochimaru is at his weakest. It'll get interesting in 345, though. In that spoiler, it just seemed like they were just messing around. Not serious.
