I’m both excited and curious- the character they showed was clearly modeled after Elsa, but Elsa as we know her is very specific to the Disney film. The original tale is a completely different story. It’s not really the Disney version of The Snow Queen- it’s only *inspired* by The Snow Queen. Will they make Elsa like the Disney character or base her on Anderson’s story in which she is evil? As someone said, Once isn’t about the Disney films usually. It’s about the original stories- they just added a lot of Disney influence.
I don’t think they have an agenda in bringing in Frozen…the writers are just huge fans of the films themselves. Remember, OuaT is really just one big fanfiction!