Support their claim, iOS 7 Beta 4 links have already leaked on to the web from Apple's own server. However, the links are currently inactive and give you an error message claiming "Your session has expired." The build number is 11a4435d and the leaked link is for the iPhone 5.
BGR also claims we will see two more betas and that a gold master will be released in September.
Sources say iOS 7 Beta 4 will pack bug fixes, graphics and UI enhancements, and a couple of other enhancements.
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