Mods support is here
Overwatch players, modders, and budding game developers can now create games in previously unimaginable ways with a brand-new feature—Workshop! Now available on the Public Test Realm on PC, players can create a Script within Workshop to add Rules and unique play Conditions on top of the established Overwatch game modes they already know and love. Rules can do things like change how a hero’s movement and abilities work, modify how players are damaged or healed, or even display text under certain circumstances.
Workshop Key Features
To access Workshop on the PTR and start creating a script, while in game, click Play > Game Browser> Create > Settings > Workshop.