During the party for 200th episode of Grey's Anatomy (the episode will air on October 10th), Shonda Rhimes talked to TVGuide and revealed that there will be a wedding this season, but don't expect her to spill on who will be getting married and/or when during season 10.
"I've been planning one, so I think we're going to see one, yes. I'm not going to say a word, but we've been making plans for that kind of thing."There can be a few possibilities of who can be getting married, so let's take a closer look at the couples.
April/Matthew: They got engaged towards the end of season 9 and with April talking about her wedding in episode 7 of season 10, it's highly possible that she could go through with it despite her telling Jackson that she wants to be with him during the season 9 finale.
Richard/Catherine: After Richard's close call with death, he could realize that life is too short and propose to Catherine.
Callie/Arizona: While they had a wedding ceremony, same-sex marriage wasn't legal in Washington State (where the show takes place) and since it's now legal there, they could have a legal wedding after they get help with their issues and reconcile.
Alex/Jo: A new couple, but it's been suggested that Jo is Alex's person, so that's why I've added them to the list.
Now for my guesses on who it definitely won't be and who I think it will be.
Couple that will NOT get married: April/Matthew. I just have this feeling that April will back out of the engagement because she still wants to be with Jackson. Will Jackson reciprocate the feeling, though?
Couple that will GET married: I know it's not looking good for them at the moment, but I'm going to say that Callie and Arizona will have a legal wedding during the season 10 finale.
Runner-up couple that COULD GET married: If I'm wrong about Callie/Arizona, I think the next possibility will be Alex and Jo. Like it's was previously mentioned, Jo is Alex's person, so I could see them getting married.