Blizzard released a new playable map, Rialto, from April's event, Overwatch Archives: Retribution.
Rialto is an escort map that takes place at the Rialto in Venice, Italy. Released with the May 3rd patch, "Rialto was home to Talon agent Antonio Bartalotti’s sprawling estate and the backdrop to the infamous 'Venice Incident,' which has recently been declassified."
The Rialto is beautiful. And unlike other maps, Rialto is quite expansive and wide open. Widowmaker and Hanzo will have a field day with all of the balconies, rooms and alcoves to hide in.