Realistically? Revolutionaries vs. CP-0: Imo, high chance. I think Oda introduced:
- The 4 World Commanders
- Ivankov as the Paradise Commaner
- Kuma as the NW commander (when he is rescued)
- Sabo as 2nd in command
I think many of these characters will be facing off against CP-0 in the end. Unsure CP0's numbers (at least 4 masked men + Stussy are new, plus Lucci/Kaku currently), but if it matches the ~7 Revo Commanders + Dragon, there may be some precedent here.
Sabo v. Lucci seems to have major precedent considering their previous collisions in non-canon material, but we'll see. I still believe one of the masked men currently is the leader of CP-0. Who knows if the former CP9 members will have a major presence in CP0 in the end, we really don't even know why they are in CP0 to begin with after being hunted down pre-timeskip.