Well, the time of a new chapter is almost approaching and at least to me, the result of Naruto and Sasuke's fate will be revealed. On one hand, you have a mysterious person approaching to Sasuke and it is claimed by Karin that it's someone who she doesn't know but made her feel uneasy about the presence, so she rushed there. On the other hand, you have Minato was going to transfer Yin Kuruma to Naruto, only to get snatched by Black Zetsu, and to make the matter worse, Madara arrives. You could argue that Naruto's situation is much more complicated than Sasuke, but the point is that both of them are facing death if the needs are not met. While there are many possibilities how they can live or die, let's discuss what happens if one goes to one direction.
If they both live, that would mean the mysterious guy, who by the way betting on Kabuto to be the one, would be helping Sasuke instead. As for Naruto, well he will live as well, but the idea of how is all up to people's guess as good as mine. Some would say that he will still get Yin Kuruma back, though the only question is how. Some would say that Gin and Kin inside those RS tools is the answer to save Naruto since they hold Kuruma's chakra, though as of late, it has been said that their chakra were already taken when Naruto extracted from Obito. To me, the closest I can see is that Madara will be full of himself and Kakashi and Gaara can't hit him since he is a Jinchuuriki. Sakura and Minato will think it's all over, but TenTen will surprise Madara with the tool and pretty much lose balance due to ambush and perhaps the tools are the only thing to phase Jinchuuriki. Not the idea to beat him, but I can see Madara and Black Zetsu being distracted and Minato might do something to retrieve back. The rest is a guess that can go any ways. Either way, Naruto will live.
If they both die, then the mysterious guy will end his life for certain, and Karin will be there to see it happen. As for Naruto, Madara will knock everyone out, including Sakura. If she leaves, Naruto will die immediately. She is vulnerable, so she can't defend herself when her hand is on Naruto's heart. Hm, imagine that, she holds his heart, but when Madara knocks her away, she rips it. Ok, no more jokes. Ahem. Another way for him to die is time. Sakura can't do that forever since a person's life grows weaker when they're already facing death. Therefore, it's possible that Naruto is this close from death and Sakura is doing everything she can but life is life, so he dies. There are other ways to have Naruto die, but I won't go further details because those are the only ones that I can think of.
If go to the bad route, we know that these two can't stay dead forever. That said how will they come back from the dead? Well, for starters, we have Obito sticking around for whatever reason. It's possible for him to wake up and see Naruto in death bed, so his last will of fire will strike and perform one last revival. Will it be for all? I don't know, but at the very least, Naruto can be revived this way. This also could conclude Obito's story in a good way, rather than a complete dark turn he once had. As for Sasuke, well if Obito can't revive everyone, then what? Well, what if the mysterious guy was going to help Sasuke, but Sasuke is already dead. Let's not forget that Karin can't feel his chakra anymore, so it's hard to determine if he is dead or near dead. Going up to the person will confirm it. That said what if that mysterious person does the revival part. If it is Kabuto, well he is a medical guy, right? Time will tell on this.
As for the chapter itself, the next chapter is the 8th of the volume, so that would mean a twist/climax of the theme is going to happen. This volume is about the end of the world or rather the end of the heroes. That said the fact Kishi stalled time to reveal the mysterious person goes to show you that he wants to match nicely with Naruto and Sasuke's result. It could be argue that the result from them could revisit chapter 662, only this time, it can be either good news or bad news. Now, it is true that Kishi can stretch this to later chapters, but if he is going to make the 8th as the usual twist/climax, this is it.
So, let's talk about the future once this event is done. Team Taka, as much as I like seeing them, especially Karin, there might be one part that makes me question the situation: if the mysterious guy does the saving or even healing, what's the point of them reaching to Sasuke? Don't take it a bashing way, but what I'm saying is what is the point for them to regroup with Sasuke? They actually had a great chance to defeat Zetsu, but instead, they left and pretty much the Alliance got to handle the rest, though I think they have a shot to beat him down themselves. Going back to Naruto's situation, what's the point for Sakura to be the only one that is capable to help Naruto since Tsunade and many others were very low on chakra? Granted, CPR and other, but still. Haha. Anyway, people believe it's setting up for one large pairing moment from their respective pairings. Well, ok, that is possible, I mean we did get Sakura and Karin's strength and determination, as well as gaining more developments towards the heroes. That said will that be all? I wonder sometimes, but I guess we have to wait. I mean I wouldn't mind if we get pairing moment, but maybe I'm asking a little bit more. If I don't get it, then it's ok. If I do, color me hype. It does refer to my headcanon, but I won't say it. Until then, let's hope for hell of a conclusion.