A new report citing a "trusted source" claims that Apple is going to release the second iOS 9 Beta later today. It further states that the company is expected to release iOS 8.4 GM build today as well.

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iOS 8.4 GM release:

Report from BGR shares that Apple is confirmed to release the golden master build of iOS 8.4. iOS 9 Beta 2 is also expected but could move to next Monday, on 29th of this month.

"Apple is currently planning on releasing iOS 8.4 GM today. iOS 9 beta 2 is also scheduled for release today, though it’s possible they could move it to next Monday, the 29th."

A two-week interval between updates is a standard for beta releases, with only a few exceptions in the past. iOS 9 was released by Apple at this year's WWDC;the operating system brings many new features including multitasking for the iPad, new Notes app, News app, and more such updates to various apps bringing stability and performance improvements.

This schedule seems likely to be followed considering previous iterations of iOS releases, however, BGR has a mixed track of sharing these reports. So keep a salt shaker nearby just to be sure.

iOS 8.4 final release is expected to come later this month with Apple Music and other features. Apple Music streaming service officially launches on June 30 and would be running on iOS 8.4. It is expected that Apple will release final iOS 8.4 for public before or on the same day of its Music service launch.

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-Source: BGR