According to sources, actor Colin Firth is in negotiations to play the character William Weatherall Wilkins in Disney?s upcoming film ?Mary Poppins Returns." Emily Blunt, Meryl Streep and Lin Manuel-Miranda have already been cast in the movie, which is slated for a 2018 Christmas Day release. Blunt will star as the titular character while Miranda will play a streetlamp lighter named Jack, who shares similarities with Dick Van Dyke?s character from the original movie, which won five academy awards. The film will be directed and produced by Rob Marshall.