(Unconfirmed Spoilers)
Source Claims to be a contributor to a SW Spin off book
Take with a pinch of salt
>Movie features huge dollops of fan service (maybe due to bad feedback from last movie and test screenings?).
>Force Ghosts feature VERY Heavily.
>Rey discovers that the Sith and Jedi have been fighting for millennia and this is just the most recent (and final) act in the long conflict.The sacred texts from last movie hint at this, Force Ghost Luke confirms. Seems no way to break cycle.
>Force Ghosts of Jedi train Rey for 'final battle'.
>The Sith have a form of Force Ghost called in the Materials a 'Sith Wraith'
>Sith Wraiths rely on physical objects - without them they cannot inhabit our plane - e.g. Horcruxes in Harry Potter, Sauron's ring in LOTR. They are plot MacGuffins.
>Palpatine appears in at least three forms in the movie (Hologram, Sith Wraith and inhabiting living bodies)
>Palpatine's Horcrux was on the Death Star (but obviously survived since his Wraith is present/active).
>Sith Troopers guard his Horcrux
>Vaders Helmet is also a Sith 'Horcrux'
>We see both a 'good' ghost of Anakin (Hayden Christensen) and Sith Wraith of Vader
>Kylo Ren is absent from the First Order for most of the movie, Hux commands in his absence from the Finalizer.
>Kylo and Ren Team up to destroy the Sith Horcruxes.
Force Ghost Luke to Rey: We’ve passed on all we know. A thousand generations live in you now. But this is your fight.
> Rey and Kylo fight Sith Troopers and Dark Acolytes including Matt Smith (Palpatine meatpuppet).
>Rey and Kylo Destroy final Horcrux, but spirit of Palpatine infects Kylo.
>Epic Battle wPost too long. Click here to view the full text.