Smaug plays a rather important part in this trilogy, as the fire-breathing obstacle Bilbo and his company must overcome to reclaim the dwarves homeland. Philippa Boyens teased that there is a major battle in the final movie, The Hobbit: There and Back Again.
"The dragon is a huge, wonderful, amazing part of the story, but it doesn't end there. Everyone can suspect there's a rather large battle in film three."
The Hobbit: The Desolation of Smaug was released December 13th, 2013 and stars Ian McKellen, Martin Freeman, Richard Armitage, Ken Stott, Graham McTavish, William Kircher, James Nesbitt, Stephen Hunter. The film is directed by Peter Jackson.