Press Release, Promos, Sneak Peeks, and Theories below

Press Release:

Henry awakens to a cursed Storybrooke and discovers Emma has been in the mental hospital, and the Black Fairy is the new mayor. Henry attempts to help Emma regain her memory while Gold tries to find out what has really happened to Belle. Meanwhile, Snow, Charming, Regina, Zelena and Hook are trapped in a crumbling Fairy Tale Land and desperately try to figure out a way to be reunited with Emma and Henry.

Promo, for those in need of a reminder: https://m.youtube.com/watch?v=niyXbuqkAt0

Theories:

What I want to happen: everyone makes some major sacrifice in order to save people in the other realms, or the dark curse overtakes the Enchanted Forest. Emma makes her sacrifice in Storybrooke after Henry convinces her to join the fight. Years later, Henry returns with his daughter (which fits the two new cast members being added in the season finale) and opens the storybook to tell his daughter the story on the Storybrooke pier.

I think this could provide the melancholy ending we need.

What will probably happen: Regina, Snow, or Rumple dies, the rest with Henry and his daughter the same.