To all the people bitching, this Kaguya twist was hinted at ages ago. It's clear Kishimoto has been taking liberties from The Tale Of The Bamboo Cutter, and honestly I don't even see Kaguya as the last villain either, this honestly just opens the door to part III of the manga which I expected Kishimoto to do all along.
I'm very nervous as to why Kaguya wants solders at all...considering I don't think there is anyone left to wage war with on their planet...meaning there might be fights against "aliens" after all. Though seriously, I think she will be the last villain of Part II, but all of this will open the door to Part III.
Also while I enjoy current Sasuke, it's clear he has ulterior motives about his eventual goals regarding the Leaf village, but he could very well still be the last enemy of the series for Naruto to fight, though I don't really wish for that at all. Sasuke is much better as a comrade.