Nope. Custom game modes and all that exist solely on existing maps or the testing plane/box maps.
The cloest Overwatch has ever gotten to a custom map was when a (offical) OW map designer was desinging a level with his viewers on Twitch one day. Blizzard than later suprised everyone by putting it in the game for a limited time.
The cloest Overwatch has ever gotten to a custom map was when a (offical) OW map designer was desinging a level with his viewers on Twitch one day. Blizzard than later suprised everyone by putting it in the game for a limited time.