According to the official website, a spin-off OVA of Code Geass, "Nunnally in Wonderland", was announced to be released this year.
Nunnally in Wonderland official website
Director: Baba Makoto (episode director of "Kimura Takahiro
Graphic Director: Kimura Takahiro
Scenario: Nomura Yuichi (episode script writer of "Kimura Takahiro
It's a parody of Alice in Wonderland and Lelouch uses his geass wastefully to save Nunnally.
Code Geass: Nunnally in Wonderland