There is a theory out there that Rey is the reincarnation of Anakin Skywalker. What do you think of it? How would you feel if they went through with it? Reincarnation is a concept that has never been explored in the Star Wars universe.
The Clone Wars/Rebels executive producer Dave Filoni also worked on Avatar: The Last Airbender, which revolves hevily around reincarnation, and they have confirmed that they are bringing a character from TCW into Rouge One. Different Star Wars projects get ideas, stories, and concepts from each other, so I believe that Avatar, deliberately or not, has brought a new concept to Star Wars.