Being the third digital comic short, "Going Legit" will tell us how Junkrat and Roadhog tried becoming legitimate businessman during their pre-Overwatch days. The digital comic short can be found here. As you understand, "Going Legit" is not the first digital comic about Overwatch. Previously, Blizzard has released Overwatch comics about McCree ("Train Hopper") and Reinhardt ("Dragon Slayer").
Lastly, there is the Overwatch Open Beta going on right now. Help Winston to gather all Overwatch agents!