When the final trilogy of Star Wars was announced back in 2015, Colin Trevorrow was named the director of Episode IX, the final film of the Skywalker Saga. He and Derek Connolly began working on a script for the film, but in 2017, a new writer was brought in due to Lucasfilm being dissatisfied with it. In September of that year, Trevorrow exited the film, citing creative differences and Episode VII director J.J. Abrams was named the director of Episode IX.
What we got was Star Wars: The Rise of Skywalker, and many fans are divided on it. But if you ever wondered what Trevorrow and Connolly had in mind for the film, an apparent leak of their script will answer those questions for you.
Instead of The Rise of Skywalker, Trevorrow's script dated December 16, 2016 named the film Star Wars: Duel of Fates and the plot is much different than Abram's film.
The script was leaked by producer Robert Meyer Burnett who posted a video of himself talking about Trevorrow's vision.
Burnett says Emperor Palpatine would be in the movie, but only via a recorded hologram message that was meant for Darth Vader but never made it to him. Instead, Kylo Ren views the message, telling Darth Vader to take Luke Skywalker to Sith Master Vor Talum. Kylo Ren goes to the Sith Master himself but is wounded and has metal welded to his face.
Rose, Finn, C-3PO and R2-D2 go to Coruscant in search of a beacon that will allow them to call on allies across the galaxy to help them fight the First Order.
Rey's character arc is vague, but apparently she is visited by the Force Ghost of Luke Skywalker. Kylo Ren fights her on a planet called Mortis after being trained by Vor Talum. There Ren tells Rey that it was he who killed her parents.
All of the details in depth can be found at this Reddit post.