Mia Goth makes for an interesting choice as her claim to fame is really she isn't that famous except for being the girlfriend of Shia Labouf. Her wheelhouse is usually art house and avante garde films often with a strong sexual component. She does seem to be trying to create a more mainstream (and longer lasting) acting career with roles in Gullermo del Toro's Frankenstein and Christopher Nolan's The Odyssey.
The current rumor is the film is set about five years after The Rise of Skywalker so a post First Order galaxy with a production start date aiming for this fall to hit a May 28, 2027 release date. As with all things involving the Star Wars movies, until they actually complete production, its possible all this could change.