According to the last chapter, Yamato will be stopping by Udon on her journey. The only notable landmark in Udon is the prison, so there’s a good chance that Yamato stops by it. Unless King and Queen were killed, they should still be in Udon, recovering from getting liposuction and probably plotting payback against Wano. Yamato would have to beat them up.
I hope this happens because tbh I can’t really see anything else interesting happening in this cover story
First I must say, that being in love with King, I've been hoping and waiting for this cover story for two years now. I'm so glad it has finally started!
There are 5 places on Yamato's map: Bakura town, Amigasa village, the prisoner mine, Enma's temple and the Ringo cemetary. Maybe even the mountains of Kibi in the beginning of the trail will be important somehow.
Like people suggested here, I think she will find her own "scabbard" followers in those places, and it's important that she has them. Because my speculation is that her serious fight will not be against King and Queen, it will be against the Blackbeard pirates, who will come there in order to take possession of Pluton. Remember Caribou intends to sell that secret to Teach?
So I think this cover story is going to be very interesting.
As for King and Queen. I don't think they are that easy to kill, even after their defeat to Zoro and Sanji and even after Ryokugyu. Now that Kaido is gone, I think they will each follow their own agenda. Queen might be interested in joining MADS members Ceaser and Gudge, and King... well...
What did King think of when he was defeated? What did Kaido think of about King when he was defeated? King has been waiting for Joy Boy all his life. Kaido knew it, no matter how King might have denied it. King also knew that Yamato knows about Joy Boy. I'm sure he will join her, along with other former crew members. Perhaps Who's Who, who is also looking for Nika. When Yamato's crew is complete, she will be able to defend Wano against the Blackbeard pirates. Or at least, the people of Wano. My guess is that Teach will take Pluton.