The duo’s involvement was kept secret while they worked on the trilogy of Code Geass semi-compilation films, which Taniguchi hinted to being a different continuity. Without getting into spoilers, the films include new scenes and plot developments that will feed into Re;surrection.
“At the time of the television series, I intended to close the book on Lelouch’s story after the final episode,” Taniguchi to V-Storage. “However, this film, Glorification, is a little different. It wasn’t intended to be an end but a beginning.”
Taniguchi added that the film trilogy doesn’t negate the TV series nor deletes its canon, but it instead depicts a different possible outcome. The film trilogy recaps all 50 episodes, but new scenes were added, making it a slightly different story.
Sunrise first announced Code Geass Re;surrection in 2016 and said that it will air sometime after the films. The project doesn’t have a release date.