Rey being a Palpatine is whatever. It could have been a cool storyline if we had some good writers. But Luke and Leia "knowing" she was a palp the whole time is SO STUPID
Every great idea this film has gets inflated by them not thinking the idea through properly, writing in the wrong details or omitting them. There was no need for Leia nor Luke to know that she was a Palpatine, it only creates problems and inconsistencies. The whole "kill me with hate and I take over your body" point would have been good and she didn't even have to be a Palpatine, just be filled with hatred. It would not contradict Palpatine/Snoke wanting Kylo to kill her. They could even expand on Palpatine needing a body and tie it in with the last movie:
Following Luke Skywalker's death and the the Resistance being almost completedly gone, hope is rising and people with force powers are slowly revealing themselves. People are joining the Resistance but at the same time, force sensitive people have been disappearing. There are rumours that Palpatine is back and he is the one kidnapping them for reasons unknown.
-Finn could reveal to Rey that he is force sensitive mid way in the film.
-Finn could still meet the ex Storm troopers and then have some of them say that they are force sensitive and got kidnapped by Palpatine
-Palpatine just needs a strong body to take over and doesn't necessarily need it to be Rey or Kylo
-No Snoke is a clone of Palpatine rubbish
-The film could continue to destroy the Jedi-Sith dichotomy and have Rey, at the end, with a bunch of force sensitive people.
-She opens a school, takes in whoever is willing to join, and trains them/trains with them, dropping the terms Jedis and Siths and decides that the new generation of force sensitive users will be known as Skywalkers as tribute to Luke.
"Actually if you go through the notes, Lucas actually planned for a 12 episode trilogy at one point and we thought it best to go back to that idea. With this, the Skywalker Saga finally concludes."
Disney is officially announcing that the Star Wars franchise is now known as Skywalker Saga and retrospective renaming all media associated with the franchise. Disney also simultaneously announces Skywalker Saga Episode X : A New Star War, Skywalker Saga Episode XI : The Last Skywalker, Skywalker Saga Episode XII : ReRise of Palpatine.