“Black Ops III” Will Have Modding/Mapping Tools for PC 2016
Oh, What Glorious Ways to Mod CoD
Treyarch announced that "Call of Duty: Black Ops III" will have modding and mapping tools added for PC in 2016.
We will include Unranked Dedicated Server Files with the tools so you can run servers with modded content anywhere you choose.
We will provide an Unranked Server Browser so you can easily find and join servers with modded content.
Closed Alpha target date: March 2016
It should be noted that with software development in progress, certain features might be changed when it closer to release (in terms of the modding and future updates). "Call of Duty: Black Ops III" will release for PC, PlayStation 4, and Xbox One with all the features (minus modding), while the PlayStation 3 and Xbox 360 versions will release with only Multiplayer and Zombies on November 6, 2015.
Source: Treyarch Community