In today's 4th instalment of George Lucas original script for Star Wars Return of the Jedi (formerly known as Revenge of the Jedi), we get to learn about the powers he was originally going to give Obi-Wan Kenobi. Later (in episode 5-7) we'll learn about how he actually brought Anakin Skywalker back!
Maybe they'll do this with episode 9? Could this be how Palpatine could return too? In some Sith way, perhaps?