As Once Upon a Time prepares for its fourth season, one of the show's co-creators is previewing some obstacles ahead for one of the series' most popular couples.

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Belle (Emilie de Ravin) and Rumple (Robert Carlyle) will be dealing with some new troubles in Season 4, according to a new TVLine report. Once Upon a Time co-creator Adam Horowitz explains:

"There is a list of things that are brewing for Belle and Rumple to deal with, but before they do, let's let them enjoy their honeymoon."

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Horowitz is more than likely speaking figuratively when he uses the word "honeymoon" for the engaged couple, as the report clarifies, but anything is possible on Once Upon a Time.

Meanwhile, the series will also be properly introducing Elsa, the ice queen from Disney's massively successful animated film Frozen. Elsa was shown from the back during the Season 3 finale, teasing fans of the show who recognized her iconic blue dress and blonde braided hair.

However, Elsa may not be the only Frozen character appearing in the upcoming fourth season.

"We would be very disappointed if Elsa was the only one from that world that you saw," Horowitz told TV Guide previously. "Who else may appear, we're not ready to tell you just yet."

Casting for Elsa has not yet been announced, though fans are already speculating.

Once Upon a Time Season 4 premieres in fall 2014 on ABC, though the network has not yet announced a specific air date. It will return to its regular Sundays at 8 p.m. timeslot.

Tags: Once Upon A Time television ABC