Her character, Princess Leia, will appear in the latest installment despite the actress' death as filmmakers used previously unseen footage from "Star Wars: The Force Awakens," Entertainment Weekly reported.
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Director JJ Abrams promised fans that "The Rise of Skywalker" will bring the saga started in 1977 to a close.
"So if years from now, someone's watching all these movies, all nine of them, they're watching a story that is as cohesive as possible," Abrams told Entertainment Weekly.
After the trailer airs, fans can purchase tickets online. When ticket presales began for "Star Wars: Force Awakens" in 2015, sites crashed because of all of the traffic. It happened again in April when presales opened for "Avengers: Endgame," Deadline reported.
"Star Wars: The Rise of Skywalker" officially opens Dec. 20 but some markets will have showings Dec. 19.