Naruto already got the Yin of Kyuubi. I mean if Yin is the thing Minato sealed, then Naruto already had it because this can be regenerated. Minato said he sealed half of Kyuubi's chakra, but we know that everyone can replenish their chakra after a good rest and feeding time.
Jiraya said that Minato seal the Yang in Naruto. In other scanlation, it say the dark chakra. Killer Bee explained that in order to make the tailed beast bomb, you need a ratio 8:2 of dark and bright chakra. The fact that Kyuubi can create Bijudam proves that he has both type of chakra.
Concerning power-up, Naruto already have plenty, but I think you the way you use the phrase is not correct. If by power-up you mean Jutsu, then I guarantee that he will show a lot of new Jutsus including an advanced element or KKG. Yes, after the chakra control we saw, I bet Naruto will blend more element into an advanced one.
Concerning Rinnegan, I will not be surprised. This is being foreshadows by the conversion and matching of Kyuubi chakra to each shinobi's unique trait. I think this fact is very complex. How did Naruto find out the unique trait of each shinobi on the battlefield to mold chakra accordingly. My opinion is that the Rinnegan is already being unlocked. Naruto is becoming Rikudo Sennin.