My predictions
Ok , let’s remember what had happened in the last chapter. Apparently, Madara’s plan had worked and ow he could ruled the world freely-even cats are under controlled. Well , everyone , besides Naruto , Sakura , Sasuke and Kakashi who are protected by Susanno’s and the four kages.
Firstly, want to emphasis what Tobirama had said : Why doesn’t it work on me? . So , there is one possibility that genjutsu doesn’t affect the Edo Tensei corpse. In this case , Madara have to deal with the four kages and seal them. Probably in the next chapter we’ll have some actions , a little fight between Madara and Hashirama maybe.
We shouldn’t forget about Naruto and Sasuke , they have the eremit power so they could be a danger for Madara. However, I don’t expect a lot of Team 7 moments in 678 because they can’t leave the Susanno’s so for the moment , everything is up to the kages.
I also think that 678 wil he Minato’s chapter. He is back in the village that he had sworn to protect years ago.
My sick fan mind : I don’t think this will happen but it will be just awesome if some old friends will be resurrect in order to fight with Madara. I won’t be mad if I will see Itachi again.

What will truly happen in 678...Only Kishi knows.