Saoirse Ronan probably won't be in The Hobbit
Saoirse Ronan might not be in Peter Jackson's The Hobbit after all, the actress recently told the Belfast Telegraph (via The One Ring):

"It's probably not going to work out with The Hobbit unfortunately. Because I would have been working for about a year on it and there were other projects that I was very interested in."

The young actress was rumored to play Itaril, a young elf, but had yet to officially confirm her attachment to the project.

The Hobbit is currently in production in New Zealand