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According to TV Guide, Ariel is actually going to show up in Neverland, not Storybrooke. That makes sense to us — there are mermaids in Peter Pan anyway, so why not combine those with the classic Ariel character?
We don't know much else about this character, such as who will play her or how big her part will be. That said, the writers have stated that they won't be adding new characters who have long arcs in Season 3, at least not at first, so it's possible that Ariel will start off as a relatively minor character, with growth potential if there is room for it.
Catch the Once Upon a Time Season 3 premiere on September 29, 2013 at 8 p.m. ET/PT on ABC.