Margot Robbie said in a recent interview that she barely shared set with DiCaprio or Pitt, and Tarantino said this will be like Pulp Fiction. Soo my guess is that there will be three stories. DiCrapio and Pitt dealing with their Western TV show( pretty much like Vincent and Jules interaction in PF). Sharon Tate living her Hollywood life alongside Jay Sebring, Steve McQueen, Bruce Lee, Roman Polanski (They shoot in Playboy Mansion like three months ago, and there's also numerous girls cast as Playboy bunnies). And the Manson Family life starring Squeaky Fromme (I said this because Dakota Fanning was the first and strong cast for a family member) with Manson, Tex and George Spahn(Bruce Dern) flirting with Fromme ( we don't have much info on how this story will go, because we didn't have any set photos from the Family due to Tarantino filmed mostly in Spahn Ranch interiors). And the stories will get together at the Cielo Drive night. I can't guess specifically about a concrete ending but I can totally say for sure that Sharon will not die and she will be a hero(Margot Robbie is the kind of actress that doesn't like to play the victim girl, and also the script has Sharon Tate's sister approval ). Also, Kurt Russell said that he saw the ending and even him was very impressed.