Re: THE HOBBIT (2012/2013): News, Rumors, Pics Till Release
I'm not terribly worried about Saiorse Ronan's character. It's likely Itaril will just be a minor role with no major impact on the story.
If they feel the need to introduce a character into the Elvenking section who wasn't in the book, I can think of an extremely logical candidate. But I haven't yet heard any rumor or other indication that he is slated to appear in the film.
Whatever happens on earth, that up there, that's the endgame.