A sequel to "Mamma Mia" is in the works, the 2008 adaptation of the stage musical based on ABBA songs that was one of the biggest hits in studio history, grossing $609 million worldwide.
"Mamma Mia: Here We Go Again" is being slotted for a release on July 20, 2018.
Much of the original movie's cast, which included Meryl Streep, Pierce Brosnan and Colin Firth, are expected to return to sing more ABBA songs.
The storyline is both a prequel and a sequel. It will be set in the present with the returning castmemebers, while new actors would play younger versions of Streep, Brosnan and Firth for part of the story that is set in the past.
Source: Hollywood Reporter