I’d love to for us to get an update on some of the characters that went MIA this season. So August, Jefferson and Maleficent are the characters that I’m very curious to learn more about. I know Maleficent is dead, but I’d love to see her in flashbacks with Aurora. And hopefully, we’ll get more info on August’s whereabouts once Baelfire/Neal comes into play.
I’m also excited to see our villains finally go head-to-head. I’m dying to see Rumpel, Regina and Cora take off their gloves and just go nuts with the magic. Rumpel and Regina are afraid of Cora for a reason, so I’d like a demonstration explaining why. 
Other little thing I’d love to see:
-More kisses and hamburger dates between Mr. Gold and Belle.
-More flashbacks with Jefferson and Dr. Frankenstein.
-More screentime for Ruby and Belle.
-The good guys teaming up with Rumpel and Regina to finally take down Cora.
-More info on other worlds and dimensions. The show has been hinting at Oz and Neverland for the past year now, so I’d like a little payoff for all those teases.