Quentin Tarantino wants Leonardo DiCaprio, Brad Pitt and Samuel L. Jackson for his Charles Manson murders movie

Deadline is reporting that Quentin Tarantino's Charles Manson movie will be a drama set in late 1960s and early 1970s Los Angeles, with sources telling the outlet that this is "as much a Charles Manson movie as Inglourious Basterds would be an Adolf Hitler movie." So, I would presume, this would take place in the same time frame as the Manson murders but would not exclusively be about just him. The most interesting point I gathered from the Deadline article is that the film is comparable to Pulp Fiction in terms of structure and style. 

As previously reported,  Margot Robbie was offered the role of Sharon Tate, Roman Polanski's then wife murdered by Manson’s cult, and Tarantino has also written roles for Brad Pitt, Leonardo DiCaprio, and Samuel L. Jackson. None of the aforementioned have confirmed their presence, but, suffice to say, most actors who are offered a role in a QT movie rarely deny the invite.
On 10/30/17 I wrote:

"Harvey Weinstein has produced every single movie Quentin Tarantino has directed since his 1992 debut "Reservoir Dogs." Recent "developments" have made QT homeless in terms of a production company, but word is that he is shopping around his based on the infamous Manson Family murders screenplay to numerous potential buyers. WARNING to streaming sites, he has been vocal in his disinterest with Amazon and Netflix."

"The Wrap is reporting that the filmmaker is  not making it easy for studio executives, having them  "go through a complex process in order to bid for the rights." So far, Warner Bros., Universal and Paramount have been invited to QT's offices, where they have put down their bid for the rights to the film."

"QT's last film, the highly underrated "Hateful Eight," was deemed a box-office "failure" and was met with mixed reviews. I loved it. It hearkened back to some of the talkier fare he was known for back in the '90s."

Tarantino has  a few screenplays finished up, but this seems to be the next movie. The film is actually meant to be Sharon Tate's story. Tate was dating Roman Polanski at the time of her morose death and that tragedy has spanned the decades since as the stuff of Hollywood doom. Will QT be giving us a more serious affair by tackling this story or is he going to go for the same over-the-top style (Django, Basterds, Kill Bill) of his last few films? I'm told this is a more "low-key, subtle affair."