None of them have been identified yet, but the actors include Naomi Ackie, Richard E. Grant, Keri Russell, Dominic Monaghan and Matt Smith.
As for Rey, we have no idea what to expect from her or the rest of the main Star Wars saga characters in Episode IX.
Disney and Lucasfilm remain particularly cagey when it comes to disclosing Star Wars plot information.
J.J. Abrams is back to direct (he also co-wrote the script with Chris Terrio) after Colin Trevorrow left the project, and this will be the final Star Wars film that John Williams scores.