Joker movie which stars Joaquin Phoenix as the Joker. This one is not to be confused with the other Joker movie that Warner Bros. is making, that one will center around Jared Leto's Joker from 2016's
Suicide Squad. Phillips also released this first look of Joaquin Phoenix as the Joker:

According to a press release by Warner Bros. the film follows the Joker as he transforms from a struggling stand up comedian to a full blown criminal, the official synopsis is as follows:

"Joker centers around the iconic arch nemesis and is an original, standalone story not seen before on the big screen. Phillips’ exploration of Arthur Fleck (Phoenix), a man disregarded by society, is not only a gritty character study, but also a broader cautionary tale."

The film has also added Mr. Robert De Niro,  Zazie Beetz from Deadpool 2, Frances Conroy from American Horror Story, Brett Cullen from Narcos, Marc Maron from Glow and added Bradley Cooper as producer. Brett Cullen will play Thomas Wayne after Alec Baldwin dropped out last month. Filming started this week and some behind the scenes photos have surfaced. Joker is set for release in October 2019.