McAvoy is in talks to play Bill, who was played by Jaeden Lieberher in the film last fall, and Hader will portray Richie, who was played by Finn Wolfhard. Chastain will play Beverly and Bill Skarsgard will return as Pennywise.
Director Andy Muschietti is back to direct, with Gary Dauberman penning the script.
The sequel will bow on Sept. 6, 2019, with production expected to start this summer. Variety had the news.