I was reading Kishi's interview he gave a month ago, and where he said Tobi's identity would be revealed soon.
Spoiler for Kishimoto Interview:
Question: The legendary ninja is now immortal, does Madara Uchiha have any weakness?
Kishimoto-sensei: All people, even the strongest ones, have weaknesses, however, Madara does not. So we have to pose the question, where and how will the battle go from here!? Please stay excited and wait with eager anticipation to find out!!
Question: What is the connection between Tobi and Madara?
Kishimoto-sensei: Both ninja know one another. What kind of relationship do they have? Well, that will be gradually revealed as the story progresses!!
Question: Will Tobi’s identity be revealed in the future…!?
Kishimoto-sensei: Yes, it will. In fact, Tobi’s identity should be revealed within the next couple of weeks so until then please continue with your predictions!!
Question: How will the story of Naruto and Sasuke continue from this point on?
Kishimoto-sensei: They will meet again, this time during the war. Just wait until you see what is happening then!
Question: We will soon be entering into the climax of the Fourth Shinobi World War arc, please tell us some of the key points that will be coming soon!
Kishimoto-sensei: Everything from here on out is key and everything is just going to get more and more electrifying! All your favorite characters will shine brightly so please continue to enjoy Naruto as the great Shinobi World War reaches its climax!
Interesting that he said Madara has no weakness and has a relationship with Tobi/Obito. Both of which will become important in this fight. Also that Sasuke and Naruto will meet during the war. Since this is the climax of the war, I assume it has to be during this fight.
Also it seems like this is the spot where every character will gather for the blow off with the Jyuubi potentially released. The Kages, K11, Sasuke, ninja army, etc should all be there. No more jumping around. And it does seem like the Konoha 11 might do something judging by Kishi's last answer. It would be ironic if they played a major role in Madara's defeat and succeeded where the Kages failed. .