Hmm.. here are just a list of my theories…
1. Bae will be introduced as an adult in the next season as either the father of Henry, one of Emma’s love interests, or both.
2.Either in this season or the following seasons will have the season finale with a cliff hanger as either Emma having to “seal” the deal with Rumpelstilskin and becoming the new Dark One, or Regina getting her hands on Rumpelstilskins dagger.
3. Rumpelstilskin will sacrifice himself for either Bae or Belle before the series finale, and Regina will redeem herself before the end of the series by helping fight for “good.”
4.There is an even bigger evil besides Regina or Rumpel that controls “all the worlds” that the cast will have to go up against in future seasons.
5. Emma will die as “the savior” in order to “truly” break the curse.
6. The Queen of Hearts is Cora
7.Instead of flash-backs in fairytale world, there will now be flash-forwards
8. There will be a love triangle involving Emma. (let the ship wars begin! lol)