Aside from being the final chapter of the Skywalker Saga and taking place approximately a year after The Last Jedi, no specific plot details for The Rise of Skywalker have been revealed yet. Along with familiar faces like Daisy Ridley, John Boyega, Oscar Isaac, Adam Driver, Mark Hamill, Billy Dee Williams and Ian McDiarmid all returning to a galaxy far, far away, new faces like Naomi Ackie, Keri Russell, Richard E. Grant and Dominic Monaghan have also been brought aboard.
Article source: https://www.cinemablend.com/news/2470802/the-rise-of-skywalker-trailer-has-been-watched-a-record-breaking-number-of-times