Warner Bros. has unveiled a new trailer for 'Joker: Folie À Deux,' the highly anticipated sequel to the 2019 film, featuring Joaquin Phoenix reprising his role as Arthur Fleck/Joker alongside Lady Gaga as Harley Quinn. The film explores Arthur's institutionalization at Arkham while he grapples with his identity and discovers love and music, with hints of musical elements woven throughout the narrative. The trailer showcases moments of the characters singing classic songs, although director Todd Phillips clarifies that it won't be a full musical. Set for release on October 4, 2024, the film also stars Brendan Gleeson and Catherine Keener among others, and is expected to delve deeper into the chaotic relationship between Joker and Harley Quinn. The film's world premiere is scheduled for the Venice Film Festival in September 2024, generating excitement for its blend of dark themes and musical elements.