Peter Jackson revealed on his Facebook page that Rob Kazinsky, who was to play Fili, has dropped out of The Hobbit due to “personal reasons”:
I am sad to report that Rob Kazinsky, who was cast in the role of Fili, is having to leave The Hobbit and return home, for personal reasons. Rob has been terrific to work with and his enthusiasm and infectious sense of humour will be missed by all of us. I should say that Rob’s departure will not affect ongoing filming of The Hobbit, nor will it impact work done to date, as we had yet to film much of Fili’s storyline. At the moment we are shooting scenes featuring Bilbo without the Dwarves, which will give us time to find a new Fili. I’ll keep everyone posted with updates as they come.
The Hobbit: There and Back Again (rumored title) will hit theaters in December 2012 followed by its sequel, The Hobbit: An Unexpected Journey (rumored title) in December 2013. Both films will be shot and released in 3D.