Once Upon a Time Season 3 returned with a whole new twist with last night's Season 3, Episode 12 ("New York City Serenade"). What's next, now that Emma's back to her old self and Storybrooke is under attack from the Wicked Witch of the West? The promo for Season 3, Episode 13 ("Witch Hunt") gives us some clues.

Here's what we've learned from taking a close look at the promo.

1. Bad news! The promo opens with Grumpy yelling that he has bad news. We're guessing that's linked to the flying monkeys that we see elsewhere in the promo.

2. Regina vs. Zelena, the Wicked Witch. At :03 we see Zelena, the Wicked Witch, entering Regina's castle back in Fairytale Land. "The Wicked Witch," Regina says angrily at :04. At :05 we see the two women facing off. "Not exactly the welcome I was expecting," Zelena says. At :07, Regina tells her, "You never should have left Oz."

Later, at :18, Regina tells Zelena, "This curse can be broken." "You really don't know who I am, do you?" Zelena replies. Hmm. Could she be hinting to the fact that she and Regina might be related?

3. Flying monkey attack! At :08 we see a flying monkey grab someone and fly off with him.

4. People are disappearing... "People have begun disappearing," Snow says, concerned, at :11.  

5. ...And being turned into flying monkeys? "They're being turned into flying monkeys?!" Snow exclaims at :14. Well, based on the next clip, which shows a flying monkey busting through the hospital, that would appear to be the case. "OK, I didn't see that coming," Charming declares at :17. Couldn't agree more, David.

6. Wicked magic. At :09 Zelena uses magic to make a sharp object of some sort appear. At :12, we see her flying off on a broomstick, laughing. It's definitely a nod to one of the iconic moments from the Wizard of Oz movie.

Check it out yourself here:

Did we miss anything important? Interpret something wrong? Let us know your thoughts in the comments below!

Catch the next episode of Once Upon a Time on Sunday, March 16 at 8 p.m. ET on ABC.

Rebecca Martin is an Associate Editor at Wetpaint Entertainment and our resident Game of Thrones, Breaking Bad, and genre TV expert. Follow her on Twitter and Google+!