StarWars.Com Has published an official article tonight and it's big news when it comes to Star Wars IX. 

Star Wars: Episode IX will begin filming at London’s Pinewood Studios on August 1, 2018. J.J. Abrams returns to direct the final installment of the Skywalker saga. Abrams co-wrote the screenplay with Chris Terrio.

Returning cast members include Daisy Ridley, Adam Driver, John Boyega, Oscar Isaac, Lupita Nyong’o, Domhnall Gleeson, Kelly Marie Tran, Joonas Suotamo, and Billie Lourd. Joining the cast of Episode IX are Naomi Ackie and Richard E. Grant, who will be joined by veteran Star Wars actors Mark Hamill, Anthony Daniels, and Billy Dee Williams, who will reprise his role as Lando Calrissian.

The role of Leia Organa will once again be played by Carrie Fisher, using previously unreleased footage shot for Star Wars: The Force Awakens. “We desperately loved Carrie Fisher,” says Abrams. “Finding a truly satisfying conclusion to the Skywalker saga without her eluded us. We were never going to recast, or use a CG character. With the support and blessing from her daughter, Billie, we have found a way to honor Carrie’s legacy and role as Leia in Episode IX by using unseen footage we shot together in Episode VII.”

"John Williams, who has scored every chapter in the Star Wars saga since 1977’s A New Hope, will return to a galaxy far, far away with Episode IX."

Source - StarWars.Com