I'm tentatively planning on an OUAT costume for D*C this year, though I'm waiting until the end of the season to decide on which one (top picks right now are Emma or the Siren, but I'm making myself wait it out, hehe). I'm already a member of the FB group, but I thought I'd keep an eye on the chatter over here too.
Upcoming costumes - Dragon*Con 2013:
Steampunk Tinkerbell (original concept) - 100%
River Song - Day of the Moon dress (Doctor Who) - 100%, adding props
Samantha Winchester - Winchester Sisters (Supernatural genderswap) - 100%, adding props
Abaddon - As Time Goes By dress (Supernatural) - 90%