I think Zoro will always be by Luffy's side; their bond is truly unbreakable, although I do see Zoro being offered a position of leadership by the Scabbards before he leaves. At this stage though, I see Hiyori being the Pudding to Zoro's Sanji. Here are some similarities between them:
I hope to see Hiyori reveal her true nature to Zoro soon, although with the 'Zoro avenges Yasu' plotline, I can see that happening soon. I can see Hiyori falling for Zoro because he reminds her of her father and the Scabbards' bravery, and also for how much he has helped her brother.
I think Mihawk will be hyped by defeating the SSG or at least escaping unharmed. I see Boa being the SSG's first major victim, or at least suffering a huge blow from the marines, leading her to seek out Luffy again. Mihawk and Weevil on the other hand should be interesting to look out for in the near future, particularly if admirals were sent after them.