It is going to be a simultaneous release of multiple products. A manga, titled Code Geass: The Jet-Black Renya (Kōdo Giasu: Shikkoku No Renya) was recently announced featuring a seventeen year-old boy named Renya with a mechanical arm and shuriken as his weapon of choice. It begins when he encounter's C.C. It is supposed to be set in the Edo era.
Basic summary. but yeah, new Geass.