The official website for the Code Geass: Akito the Exiled series began streaming the promotional video for the 3rd episode titled Code Geass: Akito the Exiled 3 – The Brightness Falls on Friday. The new promotional video gives us a preview of the opening theme song More Than Words by Maaya Sakamoto who is also a voice actress and voices Leila Malkal in the series.

http://www.dailymotion.com/video/x2cvrzp

Yukana (Ai Nanasaki from Amagami SS, Cecilia Alcott from Infinite Stratos) will return to reprise her role as C.C. in the third episode.

The third episode, Code Geass: Akito the Exiled 3 – The Brightness Falls, will premiere on May 2. The fourth and final episode, Code Geass: Akito the Exiled 4, will premiere on July 4.

In addition to this, a new visual was also revealed:

Code Geass Akito the Exiled 3 Anime Visual Revealed haruhichan.com Code Geass Boukoku no Akito 3 Visual

Code Geass: Akito the Exiled is a theatrical OVA. It was officially announced in the bonus materials of Code Geass: The Miraculous Birthday. The new theatrical OVA is directed by Kazuki Akane (of Vision of Escaflowne and Noein: Mou Hitori no Kimi e fame) and once again features original character designs by CLAMP. It is a side-story that occurs between seasons one and two of Code Geass.

Code Geass: Akito the Exiled 3 – The Brightness Falls synopsis from Haruhichan:

Third episode of Code Geass: Boukoku no Akito.

Source: ANN, otakomu, Code Geass: Akito the Exiled website