Kishi is setting it up pretty nicely, although the thought of it all being destiny dulls it a bit, and Naruto's simple mindedness is predictable, I still think it makes for an epic storyline. Naruto being Sasuke's rival and can actually catch up with him hints at his senju bloodline, that with the flash of Kyuubi/Sage eyes, Jiraya speaking of the "key" the 4th left behind for Kyuubi's seal, and the 4th admitting he implanted Kyuubi in Naruto to stop Madara, sounds like Naruto definitely is going to completely harness Kyuubi's powers.
Yeah...Raikage is going down somehow, hate to say it, seems like Kishi also set it up to make Sasuke even more hax for :naruto: vs :sasuke: and hes gonna prove it. =/ Also I don't know if Sasuke is the final villain. I see it as Nagato was Naruto's anti-thesis. Naruto proved he's the prophecy, and since Nagato was the "reincarnation" of Rikudo, then Rikudo chose "Senju"(Naruto) to bring peace. Which is to end all cycles of hate, which stems from Uchiha's hatred of not being chosen. (Like Hashirama was Hokage and not Madara).
Naruto is gonna beat Sasuke, and convert him to the good side, blah blah and then take down Tobi with his help.
Also I'm pretty sure since there are only 3 known dojutsus, and it was stated by Kakashi that Sharingan was derived from Byakugan(or thought to be.) then Byakugan was the first to come from Rinnegan.
Also to contribute to my Wall of Text and as a side note, I love Hinata but since Kishi just loves to foreshadow everything, it seems Naruto is getting with Sakura, since one of Jiraya's last thoughts was that he didn't get with his love (Tsunade), that he couldn't save his best friend Orochimaru, he couldn't save the world from Pain, so that he failed and hopes that Naruto won't. So yeah...*yawn* I still love it though...