According to the @PlayOverwatch Twitter account, much-anticipated Overwatch competitive play, once thought to be headed to gamers in June, is now coming later in July. If so, it will mark the second time that competitive play has been delayed -- first taken out of the release version and now for up to a month after it was said to be coming out in June.
@adrianmaturell We'll be introducing our Competitive Play (hopefully) later in July. Stay tuned!
— Overwatch (@PlayOverwatch) May 27, 2016
Source: IGN