Ok, so we all know that Jariya was trying to train Naruto to use the Kyuubi chakara ... Maybe, MAYBE Jariya was also trying to teach him something similar to wood release ... I know he doesn't have the affinity for it, that why I say similar... Yet with the seals holding the Kyuubi in, he had extremely poor chakara control and has been unable to do this ... "that jutsu" may be what lends him a hand in controlling the Kyuubi ... now that the seal is released he can manipulate his chakara like nothing he has before ... just an Idea...
As far as new jutsu's ... I cant really say ... Permanent sage mode?
Also I just remembered ... pre-shippuuden, Didn't Tsunade say that when Naruto uses the Kyuubi chakara it takes away from his life (shortens it)?