Apple has released second betas of iOS 9 and watchOS 2 to developers, continuing the beta cycle for its next-generation mobile operating systems announced at WWDC for the iPhone, iPad, iPod touch, and the Apple Watch. Featuring a build number of 13A4280e, the second iOS 9 beta features a number of under-the-hood improvements from the first beta, focusing on improving the stability and reliability of the new features in the operating system. The latest watchOS beta has a build number of 13S5255c and is installed via a configuration profile that requires the corresponding iOS 9 beta to be installed.
These releases are also accompanied by a second beta of Xcode 7 to support the new APIs and development environment. Apple has also been releasing iOS 8.4 betas in tandem with the iOS 9 development cycle, with the 8.4 version expected to be released within the next week to support Apple’s new Music service, although at this point iOS 8.4 remains in its fourth beta version released two weeks ago; it is unclear if another beta or “GM” version will be released prior to the final public release.