According to official blog, anime movie project of the original anime TV series Code Geass: Lelouch of the Rebellion was announced.

This is separate from Code Geass Gaiden: Boukoku no Akito which is set to premiere early summer. Code Geass producers Yukawa Atsushi and Yoshitaka Kawaguchi described the  movie project as a “dream” as screen of the press conference displayed “project has been launched.”

Code Geass: Lelouch of the Rebellion Anime Sypnosis
The Empire of Britannia has invaded Japan using giant robot weapons called Knightmare Frames. Japan is now referred to as Area 11, and its people the 11’s. A Britannian who was living in Japan at the time, Lelouch, vowed to his Japanese friend Suzaku that he’d destroy Britannia.

Years later, Lelouch is in high school, but regularly skips out of school to go play chess and gamble on himself. One day, he stumbles on terrorists 11’s who’ve stolen a military secret and is caught by a member of the Britannian task force sent after them, who is Suzaku. As the rest of the squad arrives, Suzaku is shot for disobeying orders, while the military secret, a young girl, gives Lelouch the power of Geass, which makes anyone obey any order. While Suzaku is secretly made the pilot of Britannia’s brand new prototype Knightmare, Lancelot, Lelouch becomes the masked Zero to lead the rebellion to destroy Britannia once and for all.