I don't know why people are so upset. We finally have the possibility of watching a fairly decent battle, with people getting butchered left and right. And Nagato isn't around to use that big resurrection jutsu, so people will stay dead. Assuming that Kishimoto doesn't pull one out of his ass (which is likely).
Plus, I'm a sucker for anime/manga that do the whole "WE CAN WORK TOGETHER GUYS" shtick.