I don't think we'll see anything about Zoro's father in wano. We just got out of an entire arc of Sanji's family drama and with the whole sabo situation, we're about to get into Luffy's family drama real soon.
I just think Oda would do something different with Zoro.
What I really would like to see is some sort of explanation for asura. Zoro used the move twice hundreds of chapters ago and I really hope Oda will bring it back, flesh it out, and give some sort of backstory to asura itself.
I think my headcanon will be that Zoro uses asura against king and while they are fighting, hitetsu makes some sort of comment that Ryuuma was said to be capable of using a similar technique.