In the DC Extended Universe, Jared Leto is playing The Joker, who was introduced in Suicide Squad and is expected to return for Suicide Squad 2, Gotham City Sirens and the Joker/Harley Quinn movie.
Leonardo DiCaprio was previously rumored to be a candidate to play The Joker in this movie, but Phoenix would be just as good of a score, if not more so.
This isn’t the first time that Joaquin Phoenix has been been courted for a comic book movie.
However, assuming this new report is correct, it sounds like Phoenix is all on board to play The Joker, and looking at his body of work over the years, he certainly has the talent to effectively ooze this DC villain’s brand of crazy.