Throw this one out there....
It's said a character from the PT will be in the new trilogy, we see two robotic arms holding Vaders helmet. Could this be General Grievous returned? after all he was mostly a droid, that could have been downloaded into a new body, he was trained in the jedi arts and he collected light sabers as he had a stash of them under his cloak. Just speculating.
Han and Chewie take back the falcon after a scuffle, then chewie and han, leia and solos daughter go find solos son as the daughter said her brother is acting strand and collecting a bunch of sith objects. They locate her bother Han tries to tell him to cut it out and bring him back and they embrace and then you here a sound of a lightsaber igniting and that was solos son igniting the saber against solos stomach thus stabbing him with it. Chewie is banged up from the fight to get the falcon back so he cant help, they all fly away. Leia seeks out luke and asks for his help to bring her son back to the good side as he did for their father then you see luke stand up and go , then credits after the funeral.