https://www.pcgamer.com/overwatchs-next-pve-mission-is-a-blackwatch-strike-in-italy/

Last year, the Overwatch Uprising event delved into Overwatch's history by giving players a chance to experience Tracer's first mission: the King's Row Uprising. This year, the event—now officially named Overwatch Archives—returns with a new PvE mission: Retribution.

Retribution is a Blackwatch mission involving Reaper, Genji, McCree, and Moira that took place approximately one year before Uprising. The mission takes place in Venice, Italy on a map called Rialto, with the Blackwatch team fighting against the forces of Talon. Following the Retribution event, Rialto will also be introduced as a PvP map, though it will first make its way to the PTR for some testing.