The Pony Canyon publicity representative who goes by the name "nojitetsu" revealed the basic story premise of the upcoming K-On! film on Saturday. According to the representative, the film will depict:

Spoiler (highlight the following white text to read) [ The members of the female high school band Ho-kago Tea Time on their graduation trip to England. ]

The film will open in over 130 theaters in Japan on December 3. It will depict a story not told in the television series adaptation of kakifly's manga, even though it will follow the five female members of Sakuragaoka High School's light music club while they are still attending high school. The original television voice cast will reprise their respective roles in the movie, as will most of the main staff.

Image © kakifly, Houbunsha/Sakuragaoka High School Light Music Club

[Via 0taku.com]

Update: Image and background information added.

Update 2: The K-On! official website updated on Saturday to include the movie's story introduction and a new key visual image (pictured above).

Update 3: Voice actress Aki Toyosaki confirmed that new songs have been made for the film. [Via Yaraon!]