Surface components (stones, plants, roads, buildings)
Am... Am I actually seeing this right now? Roads and buildings? Wow... This is looking to be one epic space simulator once it's finished.
Also, I am really looking forward to the 3D clouds, better water and more detailed landscapes. Planets would look so insanely gorgeous with those three improvements...
Unfortunately this won't be in SE soon, there are plenty of other things to be done before.