According to official website, it was announced the second season of music-sci-fi anime series AKB0048 will air this coming January 5, 2013.
Season 2 is called “Next Stage“ and it will be the continuation of the story of Nagisa, Chieri, Orine and Yūka and other AKB understudies as they set off to their next stage.
Synopsis of Season 1
At the start of the 21st century, an interplanetary war broke out. Earth’s ecosystem was damaged, and humanity was forced to flee the planet. In this new society, things that “disturb the heart” like music and art are forbidden. 48 years later, a legendary idol group is resurrected as AKB0048. Labeled as terrorists, they must take up arms to defend their careers and their fans. [ANN]
Source: Official website via MyAnimeList News