OOh we get to see our second all out attack on Konoha. I like seeing the senior ninjas, some the parents of the current generation fight, because they're all so similar to their children. Last time they helped protect Konoha.
I'm not such a huge fan of Killerbee, but the Raikage and his company seem interesting.
It's awesome that Pain is named Demon, Animal, Ghost, God, Human and Hell individually.