I think the major thing that happens to the Charmings, in addition to Cora and Hook being in town, is the arrival of the outsider, Barrett, (which I think is also to do with King George standing trail for Gus’ murder and botched frame-job on Red). Barrett, who has a dark side which he tries to justify, sounds like he could stir up trouble.
I am really looking forward to seeing Charming and Emma interact. Yet, I’m not sure how much we’re going to see them interact right away. There are new BTS shots of Charming and Snow, along with 7 dwarves and Ruby, pulling someone out of a hole. It looks like Emma and Henry are out of town, because Charming is wearing a sheriff badge, so he may be the acting sheriff or deputy while Emma is away. Maybe she's off finding Mr. Gold's son and Henry is with her. 😀 http://vancityfilming.com/articles/once-upon-a-time-get-out-of-a-hole/
"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy