When Pretty Little Liars returns for season 4B in January, fans can expect an unlikely but interesting pairing.

Pretty Little Liars fans wanting to know why Ezra (Ian Harding) and Mona (Janel Parrish) were seen conversing in the new promo for season 4B are right to be curious. PLL executive producer Oliver Goldstick told TVLine recently that their interactions will be of importance to the story.

"It looks like Mona may have had an interesting relationship with Ezra, and we'll explore that," Goldstick said, explaining that they'll "reach a sort of agreement, [but] we don't know what it is. Is he onto her behavior? Or is she onto his? Something is going on between the two of them. They become strange bedfellows for whatever reason."

Meanwhile, Aria (Lucy Hale) will continue to have romantic problems in season 4B.

"She's tremendously romantic," PLL writer Joseph Dougherty told HollywoodLife recently. "She's still looking for romantic perfection, and it makes her so vulnerable."

Dougherty also said that Aria will choose between Ezra and Jake (Ryan Guzman) this season, promising she'll "make up her mind fairly definitely early in the second half of the season."

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Additionally, fans wondering where Toby (Keegan Allen) was in the promo for the upcoming episode do not need to worry. Dougherty said that Toby will be back with Spencer (Troian Bellisario) in the beginning of season 4B.

Pretty Little Liars returns for season 4B on Jan. 7, 2014.

Watch a trailer for the next episode, titled Who's in the Box? here:

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Pretty little liars, Spoilers