Today
Since the organization disbanded, tensions have once again arose between humans and the Omnics, and this was exacerbated by the terrorist organization Talon. The organization was responsible for killing the Shambali leader (all Widowmaker’s doing), and they’ve also been attacking older Overwatch outposts in an effort to retrieve the locations of past Overwatch agents.
In-game interaction suggests that Mercy was the one who revived Reyes, and was reborn as Reaper. Now working with Talon, Reaper led the assault on Overwatch outposts to eliminate all surviving operatives. As for Morrison, he took on the identity of Soldier 76 and started on a journey to uncover the truth behind the collapse of Overwatch.
It was Winston who thwarted Talon’s efforts to retrieve that information, and he illegally issues a recall to all Overwatch agents, bringing the crew back together. This marks the start of the game.