Board Thread:Spoilers!/@comment-4877635-20130819184840/@comment-24001535-20131008221743

Apparently this is what the episode is about:

"Peter Pan's hideout is revealed. Meanwhile, Emma's strange growing heelings for Hook continue growing. Pan begins no trusting Felix when he tells Henry a secret about Pan. back in the the Enchanted Forest, Neal tries to steal Robin Hood's prized possessions. In the Fairy Tale Land that was, Felix's life is turned upside down when Peter Pan gives him a choice to become a very powerful man."

-That last part HAS to be the Dark One, because it is suposed to be a Rumple based episode.