With less than a month to go before its annual Worldwide Developer Conference, Apple on Monday issued third betas of iOS 8.4 and OS X 10.10.4 to developers, and second public betas to people in the AppleSeed testing program.
The latest iOS build can be downloaded as an over-the-air update for people that already have iOS 8.4, and should also be available as a complete download through Apple's iOS Developer Center. Any unusual changes in the code have yet to be discovered.
The central feature of iOS 8.4 is a radically redesigned Music app. Some improvements include global search functions, gesture controls, and an omnipresent MiniPlayer allowing playback control from anywhere in the interface.
The prior beta was released exactly two weeks ago.
Apple will show off the next-generation version of iOS, assumed to be iOS 9, at WWDC when it starts on June 8. The general public will likely have to wait a few months before they get their hands on iOS 9, but iOS 8.4 will likely see release much sooner.
The latest OS X 10.10.4 beta is identified as build 14E17e. As with the previous one, also dating back two weeks, Apple has released no other info. The software can be downloaded via the Mac Developer Center or the Mac App Store's Updates tab.
The Yosemite update will presumably be finished in time for WWDC, where Apple is expected to show off the next major version of OS X.