I've said it before and I'll say it again, I would love to see the whole idea of slavery in the Star Wars galaxy actually addressed in the New Republic.
It was tolerated outside the Old Republic and inside the Empire, the Clones were genetically engineered slaves and the droids (shown to be sentient to varying degrees) are also slaves.
I hope they keep the Stormtroopers as clones and have a plot where what to do with them is a major feature.
Surely the heroes of the OT wouldn't exterminate them for obeying orders they were genetically programmed to obey? Technically these are victims of the war as much as anyone else.
But wouldn't their victims want revenge?
I also suspect Leia is very open to the temptations of the Dark Side which would be another riff on Dune where her near namesake suffered the same fate.
I wouldn't have Palpatine in it as a living character but he could return as recorded footage or a nasty force ghost and manipulate living people as a twist on what Ben did in the OT.