Is Blizzard Teasing Overwatch Hero 28 ?

Looks like Blizzard is teasing something on the Overwatch Twitter. The tweet is simply captioned "Calm before the storm" and is a short video shot of an alley with various posters. One poster shows a chimp in a space suit tagged with "NO BOTS." The area is not recognizable as any existing Overwatch map. Could this be the first teaser for Hero 28 ? Thoughts ?

Calm before the storm. pic.twitter.com/yxzXyzdzuA

— Overwatch (@PlayOverwatch) June 21, 2018

Rolling through. pic.twitter.com/T3fPXbTMQl

— Overwatch (@PlayOverwatch) June 26, 2018