There is no big feature left on the agenda. My main focus now is game balance in terms of tech speed, civ strengths, and UHV difficulty. After that, the only thing left is rounding out the game aesthetically and completing some work that I intentionally left for the end like dynamic names, great people names, UHV titles etc.
There has been no intentional change in unit art. You are probably comparing the state on the development branch with the VD module with a previous release that had the module included.