Season 3 of Once Upon a Time ended on an icy note. Elsa came into Storybrooke and while we don't know exactly what kind of trouble she'll be brewing in the small town, we did get a peek of her and Anna in Arendelle at Comic-Con. Creators Edward Kitsis and Adam Horowitz were joined by cast members Josh Dallas (Charming), Jennifer Morrison (Emma), Colin O'Donoghue (Hook), Jared Gilmore (Henry), Lana Parrilla (Regina), Emilie de Ravin (Belle), and Robert Carlyle (Rumplestiltskin) to discuss what's ahead.

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Let's jump to the big Frozen news. A clip from the Season 4 premiere showed Elsa (Georgina Haig) and Anna (Elizabeth Lail) in a green and lush Arendelle putting flowers at the base of their parents' graves (for those of you playing at home, this means Elizabeth Mitchell will likely not be portraying Anna and Elsa's mother). Elsa and Anna are dressed in costumes similar to those seen in the animated film, right down to the hairstyles. Their sisterly love is already apparent. Elsa says she has a surprise for Anna, and it's for her wedding. Maybe we'll see Anna and Kristoff's nuptials happen on screen?In other news for Season 4, everyone is concerned about whether Regina will revert to her old evil ways. Jennifer Morrison said there's some concern about what effect the return of Marian will have on Regina, but Emma will try to keep her on the light side: "It's an impossible situation. I'm horrified that I've gotten in the way of Regina's happiness, and we become concerned she might spiral back into her old ways... Emma is going to be determined to keep her in a good place in her life and keep something positive in her life."Lana Parrilla said she's never bored playing the character, and that she's proud Regina has come so far: "She's enjoyed being good, and she's enjoyed discovering this light magic. However, old habits die hard." Kitsis jumped in and added, "Yes, they do."However, Horowitz points out it's a good sign that Regina didn't blow up Granny's restaurant when Marian showed up. That's would have happened in Season 1, so it's progress. Or is it? Another clip from the Season 4 premiere showed Regina busting the Mirror (Giancarlo Esposito) out of a locked room in the hospital. She tells the Mirror, a.k.a. Sidney Glass, someone has got in the way of her happiness, and she needs the Mirror to destroy that person. That doesn't sound promising.Rumplestiltskin's walking the line, too. Robert Carlyle called the character an addict who's hooked on power and magic, but Kitsis says Rumple's love for Belle is genuine and real. Emilie de Ravin said she thinks Belle is too trusting of Rumple, and she'd be devastated when/if she finds out Rumple lied to her.Season 4 will also see Rumple and Henry's relationship develop. Henry will go into the family business and work at the pawn shop doing inventory. Horowitz stated it's definitely a relationship they'll be exploring more - especially since Neal has died. But Kitsis added, "Neal will always live in flashbacks and in our heart." Horowitz followed up by saying, "Death may be a terrible thing, but it doesn't mean it's the last time we see someone."The final news of note: Hook is putting on regular clothes next season. O'Donoghue seemed relieved that he'd be getting out of the heavy pirate coat.

Amy Ratcliffe is a writer for IGN TV. You can follow her on on Twitter at @Amy_Geek and IGN at alratcliffe