So even though I think the last Jedi is a pile of excrement I am very excited for ep IX, they have been playing their cards close to their chest with no teaser trailer out yet about nine months out from release.
The info trickling out is that this will tie in the whole series from the prequels and be the conclusion for the Skywalker saga which I think is a good move.
So you'd have to think some involvement with Anakin and maybe (and this is getting out there) a canon reveal of good old Sheev being the one that created him in the first place. I'd love to walk out of the theatre with dust in my eyes.

I honestly believe that this could be the greatest Star Wars movie ever, it's a big call but my expectations are also weighed down to get me back to reality due to the recent track record. (Rogue One excepted)