The Official Site, provided a few details on the cast for Episode IX, including this bit from J.J. Abrams on Carrie Fisher:
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.”
Nobody wanted CGI, so this could be good news, and we should see an appropriate farewell for the Princess.