The sneak peak, below, from the Season 3 premiere was shown at Disney’s D23 Expo. It shows Rumpelstiltskin in Neverland, confronting one of the lost boys — who does something that makes Rumple cry. (Editing to add 10/1/13: The sneak peek video is no longer available. See a clip of the scene (and a poll) here: Why did Rumpelstiltskin cry when he saw the doll?)
What is the significance of the doll? This may be the season’s first mystery.
(For more info, including spoilers, that OUAT creators Edward Kitsis and Adam Horowitz revealed at the Expo, see D23 Expo: ‘Once Upon a Time’ season 3 details on Ariel, Ursula, and more.)