My only problem with Odyssey was the state it was released in. It needed another 6 months of tinkering, and I guess that just wasn't financially possible. It's a bit of a tragedy it turned out that way because of the history of Elite 2's buggy, rushed release. I can only imagine it was the last thing they wanted to do.
I think the settlement gameplay is the best thing in the game, and I would have loved to see that expanded into other parts of the Universe (stations, raiding big ships etc...).
I doubt there will be any more major, major expansions to the game but I guess it's possible that some of their ideas for the future were further advanced than we thought. So hopefully some on-foot Thargoids.
Ideally I'd like atmospheric worlds, but I doubt we'll ever see that now.