Apple has just seeded the fifth beta of iOS 9.3.3 to developers and public beta testers, one week after seeding the fourth beta of iOS 9.3.3 and more than a month after the release of iOS 9.3.2, a minor bug fix update. iOS 9.3.3 has been in testing since May 23.
As a minor 9.x.x update, iOS 9.3.3 features under-the-hood bug fixes, security enhancements, and performance improvements to address issues discovered since the release of iOS 9.3.2. No outward-facing changes or obvious bug fixes were discovered in the first four betas of iOS 9.3.3.
iOS 9.3.3 beta 5 comes following the developer launch of iOS 10, a new version of iOS that will be released to the public this fall, with the second developer beta of iOS 10 having launched just yesterday. iOS 10 includes features like a redesigned Lock screen experience, a revamped Messages app with its own App Store, a Siri SDK for developers, a new Home app for controlling HomeKit devices, a redesigned Apple Music app, and more.
The new update can be downloaded from the Apple Developer Center or over-the-air with the proper configuration profile installed.