The one thing I need the most at this point is for them to rework the trading system. I hope we don't need to wait until Civ 7.
It's a bit disappointing to see a fun idea like trading posts left to gather dust in a corner. One can see the potential by looking at Mongolia, but hell, even tile Appeal gets more love.
Also, luxury trading should interact with the trading system, though it might be too late for that at this point. THIS I do expect to see in Civ 7.
I'm looking forward to the new economy/economic mode. Even if they don't rework the base system, the new additions might make up for it.
Oh boy, will I be disappointed if the economy mode turns out to not be a thing