I'd prefer they take the series in a whole new direction, but I know that won't be the case. The bad guys who controlled the far, far away galaxy are defeated. Retreading that doesn't sound like much fun, but I know there will be Sith as the antagonists even if I don't want them there. Absolutely no evil Force ghosts of Vader or Palpatine though. They better be gone.
No Empire. That's the biggest issue to me. These movies take place 30 years after the originals. Seeing Stormtroopers or anything of the sort should be out of the question.
Bounty Hunters are okay, but absolutely no Boba Fett.
Lesser things I would like to see dropped:
Tatooine despite it showing up in the preview material. This allegedly remote insignificant planet has been in five movies. Luke was sick of it. I am too. There better be a really good reason to see it again.
The Hutts. Ties into the Tatooine bit. No need to see them again. If they show us another big slug alien I would hope its in a new location and not a laughing evil Jabba clone or offspring.
No Ewoks either!