The trailers for "The Hobbit" movies, including "The Hobbit: The Battle of the Five Armies, "The Hobbit: The Desolation of Smaug" and "The Hobbit: An Unexpected Journey" are available on IMDB.com. Enter "The Hobbit" into the search field, select from the drop down menu and click "Watch Trailer."
The trailer for the movie "The Hobbit: The Battle of the Five Armies" is also available on the official website, TheHobbit.com, as of August 2015. Select the "Videos" link from the top left of the home page, and then click "Trailer 1." A teaser video and a Billy Boyd music video are also available to view. Information about the cast, storyline and filmmakers is also available on the website.