Originally Posted by NeoKakarott023
This shows that he has 100% control of his bijuu and can draw from him whenever and however he wants.
The only thing I think the eyes meant at all was that he was about to lose it. Every time he gets really emotional he sprouts tails and loses control. Nagato just forced him to re-live J-man and Kakashi's death so I am pretty sure he would be very emotional at that point. I think because he was in sage mode and recently had the seal strengthened he was able to keep from losing himself, but Kishi showed us the fox/sage eyes to let us know just how close he came to going fox again after seeing that.
Oh and ...first post. I have been lurking here for months but finally had to post after this crappy chapter because I keep reading all the theories on the fox/sage eyes and figured I would give my own opinion.
As for the next chapter. I think we see Yahiko's death like many have already said, but I think in the chapter after Naruto explains his pain. How he was also alone, how he had to deal with the hatred... Gaara speech take 2... and shows Nagato his answer that way.