Update August 17, 2016: While official Mac support for Overwatch is still not on the cards, the new version of the Parallels software will support it. It could come to OSX, it doesn't look that graphically intensive and Blizzard has skilled Mac programmers. I believe it's a F2P game, so maybe they'll see how it does on Windows first. Bringing it to the Mac shouldn't be that difficult once it's out of beta.
Screengrab via Reddit(Blizzard responded to Polygon’s with the note that the developer has nothing to announce right now. Overwatch gameplay systems lead engineer Tim Ford also commented on Overwatch for Mac during an interview with.
“We have no plans of giving sic this game on the Mac,” Ford said. “There are several technology decisions that Apple has made that has made it a little difficult for us to release Overwatch in the way we want it to be consumed, and that is why we haven’t pursued it.” From both statements, it’s safe to assume the Overwatch installer on Mac was a bug.
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Overwatch game director Jeff Kaplan previously said Blizzard was “open minded” with regard to launching on Mac, but it sounds like now is not that time.