100 chapters ago was the reveal of the new Yonko.
Maybe since Harald is an Oni, we might get Oars, Kaido, Onigashima (and it's true name) lore?
I love the theory that Kureha may appear and thus Harald got with her too lmao. Odas impossible size difference fetishism and trolling us will come into play (pause) again.
Shanks became Yonko over capturing Loki too pretty much.
I hope we see another Gorosei in this flashback, maybe holy knights or even imu too.