Board Thread:Character Discussion/@comment-5155814-20130720195507/@comment-6175354-20130721115134

Philrena wrote: I love her tail design as well. Also suprised she is is Storybrooke didnt see that one coming!?! This promo is not canon.

It is just an announcement, that Ariel will finally debut on OUaT.... similar to the Hook  promo, last year.