I know the entire storyline (spoilers)
Palpatine returns from the dead to make Kylo and Rey fight each other which they do for 40 minutes of the movie in different locations. (like Vader and Luke)
Lando flies his ship in order to blow up a massive weapon, Starkiller Base 2. Other ships join in for huge combat scene. (like Lando and Death Star)
Finn goes to a tech-free planet where he befriends the people - especially a pretty woman - and they attack the high tech First Order. (Ewoks)
Force ghosts Yoda and Luke appear at the end. (ghosts Vader & Anakin)
JarJar Abrams' Return of the Jedi redux.