The latest Overwatch patch which pushes Hanzo changes and adds the new Rialto map is now live according to patch notes posted on the game's website.
Rialto - Overwatch Wiki
Overwatch Update Adds New Map Rialto On PC, PS4, And Xbox One - GameSpot
hanzo Archives, Page 2 of 4
Overwatch patch with Rialto, Hanzo changes, and more now live
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