Wano arc is one of the most anticipated arcs in the series. I believe 9 Supernovas are already somehow directly involved with/near something Kaido-related.
1.Luffy-Law alliance against Kaido/Shogun, which includes Zoro.
Both Zoro’s and Luffy’s groups have already arrived in Wano. Law has not yet appeared in the new arc.
4.Eustass Kid is currently imprisoned by the Yonko Kaido himself.
5.Scratchmen Apoo is currently “working” for Kaido (although I believe it’s only for now until he makes his move).
6.X Drake is revealed to be one of the Beasts Pirates’ Headliners. He had a role in destroying Tama’s village.
7.Basil Hawkins also joined the Beasts Pirates and became one of the crew’s Headliners. It is possible that he plans to side with Kaido temporarily, and wait for Luffy and form an alliance with the Straw Hats to beat Kaido.
8.Killer is either imprisoned by Kaido or is allied with Kaido or is laying low for now, waiting to make his move.
9.Urouge was at Balloon Terminal near where Kaido wrecked the Kid-Hawkins-Apoo Alliance.
Kaido is going to start the greatest war the world as ever seen and all of these 9 Supernovas are supposed to join it.