In the beginning of the latest manga chapter
I originally thought the secret with Pein was that since they were the same person they could communicate with each other. The note that Jiraiya left said that the original wasn't with them, probably meaning that they are being controlled, IMO. With this last chapter though, either he's hit a plothole, or that isn't the case, because one of the Peins had to verbally tell the others what formation to attack Konoha in. I would suggest that he only said it verbally because the girl was with them, but she and all the Pein's said they knew what was going on. So I guess my conclusion is, I'm totally confused. I'm looking forward to the next chapters in Konoha though, because they're likely to show the team members we haven't seen, specifically the stronger ones like Neji and Chouji.