http://tvline.com/2013/04/09/ask-ausiello-spoilers-on-glee-nikita-more/
Question: Once Upon a Time is in the middle of three-week hiatus for the third time this season. Can you tide us over with some scoop, please? —Ben
Ausiello: Walking Dead‘s decision to promote Sonequa Martin Green to a series regular in Season 4 doesn’t necessarily mean the end is near for Once‘s Tamara. “The challenge that we’ve faced, both seasons so far, is scheduling,” Once exec producer Adam Horowitz notes. “We don’t want to give away what our plans are for any character, but we’ve been able to work out scheduling in the past.” (Helping matters, he said, is the fact that Walking Dead resumes just as Once is wrapping S2.) Adds EP Eddy Kitsis: “Hopefully, things will work out [when it comes to Season 3]. We think she’s done a great job.”