The end of the Bleach manga? I think we will see the ending wrapping up this year.
Aizen returning? Hmm, I don't know. Depending on how he can explain more about the Soul King being a thing and comparing Yhwach's plan with his.
More of Ichigo fighting? Of course, we will see Ichigo in his final fight and reach his full power.
Urahara's past? Hmm, maybe just maybe.
Will we see more of the Soul King? Yes definitely. Ichigo, Chad, and Orihime are now in a race to save the Soul King from dying and the multiverse as well from Yhwach stabbing him.