Personally, I'm not betting on it. Feels like something too big to give away when it won't be revealed until only the second last chapter of the volume. Volume 104 though…
But anything could happen, especially if there's pressure to get its exact colours pinned down soon. I'm surprised it hasn't been on a Jump cover yet, even with one coming out right after the reveal and the next purely One Piece one not likely to come until after the fight is over.
Yeah. Next volume cover is most likely Law, Kid, and Big Mom.
Maybe bowler hat CP0 agent.