1.) They are autopsying the body of Pein that Jiraiya captured, and they are interrogating the rain ninja that Jiraiya interrogated before fighting Pein.
2.) Naruto is gonna be able to take some nasty hits now. I wonder if jutsu like Kirin and Ameratsu are no longer automatic kills. Also, the damage from wind release shuriken rasengan might be significantly lower now if he's in sage mode that it's no longer a forbidden jutsu.
3.) As for the jutsu that Naruto, I agree that it's "That Jutsu" that Jiraiya told him not to use. I think that without senjutsu chakra, Jiraiya tried to teach it to him using Kyuubi chakra instead. Now that Naruto can draw on senjutsu chakra, he will complete it. One thing that's interesting is that there doesn't seem to be damage to the environment around Naruto. I would expect a damaging jutsu like rasengan (when Naruto practiced it, he left all these trees with holes in them) to leave traces of its use. I wonder if it's a destructive jutsu or a defensive one. Recall, Hinata practiced her version of Neji's rotation jutsu at night without destroying stuff around her. We all assume it's destructive because it's fun to blow stuff up ninja style, but it could be that badass defensive jutsu we've all been asking for him to have. This makes more sense that Jiraiya forbade it given that Kyuubi chakra harms the user, while nature chakra will enhance the user.
3.) Frog-fu might be cool, but the name sounds like it's from a Disney movie. I presume that Frog-fu is not just a supplementation to make Naruto's existing jutsu stronger but also new jutsu that he doesn't yet have.
4.) Given this, Naruto will be returning much stronger, and with a good number of new jutsu for us to see. Naruto may return to finish off a body or two of Pein, but he's not fighting all six. Further, this won't be the end of Pein. I think his real self is somewhere safe so that if he does fail, he can make more bodies. I expect Jiraiya to be one of them during the fight one on one with Naruto later in the story line.