Recently, S2 has released an announcement about the map editor and its progress.
The map editor in question is in fact the K2 engine that is already used for the modifications of maps and miscellaneous objects in the current version of Heroes of Newerth.
The editor is rough and complicated to use, therefore creating a new interface and refining user-friendly console commands has been S2's main focus.
After script editing functions are implemented, the map editor will be fitted with a game mode tool, allowing the creation of new game modes such as Tower Defense and WTF.
More information pertaining to the map editor and screenshots can be found in the link below.
Links
HoN Forums - Map Editor Screenshots
