The Hollywood Reporter has learned that Jack Thorne has been hired to work on the script of Episode IX.
Colin Trevorrow, the director, and his writing partner Derek Connolly were working on the script but it apparently needs some rewrites hence why Thorne has been brought up.
About Thorne, he is a British writer. He wrote on the upcoming Julia Roberts movie Wonder.
Episode IX is eyeing a January 2018 start date for filming and will be released on May 24, 2019.