In an interview with THR, Robert Kirkman talks about some of the changes we can expect in season 4 of The Walking Dead now that there's a new showrunner in Scott Gimple. Kirkman says that this season will be a "much more character-based story", because he feels they got too far away from that last season. He also discusses The Governor's return and many other things, but since we have a nice new pic of Danai Gurira as Michonne, the below excerpt deals with that character and the mission she undertakes after her friend Andrea's death in season 3.
"Michonne (Danai Gurira) in particular is going to have quite a bit going on with her because of that [Andrea] loss. As we meet Michonne coming back this season, she's on a mission to hunt down the Governor. It's something she's very obsessed with. It's big part of her character this season. She did lose Andrea and she lost her because of the Governor. She's not willing to let that guy go or be out there. It's something that may possibly be to her detriment, the fact that she's so dedicated to finding this person. That's something that very much informs her character this season."
There's much more at the link below.