Something most Star Wars fans know is how the Original Trilogy (and to a lesser extent) the Prequel Trilogy were made up as they went along. Unlike a trilogy based on a book, like The Lord of the Rings, Lucas had a general idea where everything was going, but each movie was planned out when they came to it. That’s why Luke and Leia were all kissy-kissy in the first two movies, and then brother and sister in Return of the Jedi. That’s because Luke’s real sister, Nelith, wasn’t meant up to show up until the original Episode VII, but they quickly made Leia the sister when Lucas decided to end it with Jedi.
Thankfully, it sounds like that won’t be a problem with the Sequel Trilogy. Badass Digest has an article where Devin explains that Lucasfilm has the entire Sequel Trilogy already planned out:
â€œWeâ€™re going to redefine longform storytelling,â€ a Lucasfilm employee boasted to me, and I believe it. For the first time in franchise history, the arc of the new trilogy is planned out in advance. Theyâ€™re taking this story someplace, not just picking up the loose ends and figuring out where to go next with each new film. Even with the Prequels, which had a predetermined ending, Lucas was kind of making it up as he went along.
As he said, the Prequels had an ending Lucas was going towards but like the OT before it, they were made up as he came to each movie. It sounds like each episode of the Sequel Trilogy is already planned out, so we won’t have two characters suddenly becoming siblings by surprise in Episode IX.