“The Darth Vader that will appear in Rogue One: A Star Wars Story won’t be the Darth Vader that fans remember from the original trilogy, nor will he be a newcomer to the Sith side, like Anakin Skywalker is at the end of Episode III: Revenge of the Sith.
Warning: This post will contain small spoilers for Vader’s role in Rogue One. if you’re trying to go in blind, it might be best to stop reading now.
Kennedy said that while Vader will be used sparingly on screen, he will appear in one of the most crucial moments of the film. As it stands, Rogue One takes place approximately 19 years after the events of Revenge of the Sith, and Darth Vader still isn’t the menacing force that he eventually becomes in A New Hope. Instead, Vader is still trying to prove himself, and he’ll stand opposite Ben Mendelsohn’s Director Orson Krennic, the film’s main villain, to do just that…”