I've put a lot of working making sure every object in the game has a helper class for serialization and other helper functions related to modding, which lets us do a lot of editor work with little effort.
Editor screenshots: (the editor is really ugly but it's a low priority aesthetics wise)
Build Menu - used to just drag and drop points on the map, or if you swap to a different mode you can drag and drop roads, naval connections, and a few other options
Edit Menu - click on any object ton the map to edit its properties in a menu similar to the previous placeholder art (I doubt I'll ever upgrade the editor art but who knows), all of the menus on the left let you edit the properties of the scenario, create alternate versions, change the old ones, turn off defaults, and override global values like Spawn Rates for heroes. Let's say you wanted to play against 100% mage heroes, you could go in here change percent global spawn for mge heroes to 100% there you go.
We are planning on doing an Editor Video, but that will be the last one before the trailer - mostly because when we posted information about modding we got the least amount of interest, which I was really surprised by. Put a LOT of work into the in-game editor so I was really hoping people would be excited.