The exact plot of the movie is unknown, but it reportedly takes place in 1969 Los Angeles and involves Charles Manson and Sharon Tate. The release date of the film — August 9, 2019 — marks the 50th anniversary of Tate's brutal murder at the hands of the cult leader's acolytes.
DiCaprio is reportedly playing an aging actor. No other cast members have been announced, though Tarantino is said to be pursuing Margot Robbie to play Tate. Rumors also indicate that Tarantino wants to cast Tom Cruise as a prosecutor.
DiCaprio has taken a bit of a break since his Oscar-winning role in "The Revenant." He did executive produce and narrate last year's climate change documentary "Before the Flood," but otherwise, has been off the Hollywood radar since 2015.