The upcoming 2-cour anime from the studio founded by previous Gainax staff.
A battle action show set in an all girls high school.
The main characters are Ryuuko Matoi and Satsuki Kiryuuin. Satsuki is a transfer student who carries a one handed longsword and believes that might makes right. She attempts to subjugate the school body using her strength. Ryuuko is the one who stands in her way, and seems to be driven by revenge.
Originally the plan was to make a pure battle manga sort of series set in a highschool, with the main character beating rival after rival in combat. After Nakashima completed about 4 episodes worth of scripts, Imaishi changed his mind. The series has apparently been changed to focus on character drama instead. The rivalry between the two main characters will be a major driving force but the show will still be action-heavy.