The official website for THE IDOLM@STER announced that the film, titled THE IDOLM@STER: Kagayaki no Mukogawa, will be premiering in Japanese theaters.
Furthermore, the animation is by A-1 Pictures studio. It premieres on January 25, 2014 in Japan.
THE IDOLM@STER released by Namco Bandai Games in 2005, is a game where the player must select a girl and transform her into a popular 'Idol' who can sing and dance in live performances.
Finally, the anime series will be released in 2012.
Source: YouTube