In this interview Domnhall Gleeson and Richard Grant confirm that one of the scenes that got cut out of them in Mustafar with Kylo will be on the extras of the home release.
At 0:57:
https://www.youtube.com/watch?v=u22p691evVs
I hope to god that it doesn’t have the timecode like the TFA deleted scenes and hopefully this means they’ll release all the other stuff they cut out.