“Barbie,” with Will Ferrell now joining a cast that includes Margot Robbie, Ryan Gosling, Simu Liu and Kate McKinnon.Plot details are scarce, but Ferrell is said to play a toy company CEO in what is set to be a meta take on the famous Mattel doll, who will be played by Robbie. “Barbie” is Gerwig’s fourth film as director, with the three-time Oscar nominee sharing screenwriting credit with her longtime partner Noah Baumbach.