He confirmed that the follow-up to this year's hit cop comedy is set to shoot next autumn, rather than this autumn as was previously reported.
"We're shooting a year from September," Hill told Collider, "and Michael Bacall and I are writing it right now."
Scott Pilgrim vs. the World scribe Bacall wrote the script for the first film.
21 Jump Street won 'Best Comedy' and 'Best Comedy Actor' (for Hill's co-star Channing Tatum) at the Teen Choice Awards last weekend.
Hill has credited the success of the film to his real-life friendship with Tatum.
Watch a clip from 21 Jump Street below: