A race for the One Piece between 4 yonkos (Which we have to know in details the members of two of them). And that we also know that one last Road Poneglyph is needed (which is guarded by a member of whom we have no idea but seems powerful)...
Somehow the SH will have to get to Elbaf at some point (let's see what new characters will be introduced there).
Somehow I feel that there are characters that will return to the story in some way (Big mom pirates, Donquixote, Law, Kidd, Urouge...) Laughtale, Void Century...
Now they are telling me that there are 9 Holy Knights
I don't know man, I'm afraid... Either the story will be rushed, or Oda will need another 10 years for this to make sense.