Best guess would be a rework of the missions system plus how the players interact with the background sim in terms of economics etc. Things that enhance how people adopt roles when they play, i.e. trader, bounty hunter etc.
Stuff like network improvements is unlikely because it's multi-platform and P2P networking (so always not ideal) but things like more story-led crafted missions seems like a good thing to add to the sandbox we have already. Looking forward to seeing what they come up with.