Apple has released the first beta of iOS 9.3.3 to developers for iPhone, iPad and iPod touch. The release is around 1.4GB and the build number is 13G12. As per Apple’s change log, the new release contains bug fixes and performance improvements.
iOS 9.3.2 GM was just released a few days back and it was widely considered that it would be the last release before iOS 10, which is expected to be revealed next month at WWDC 2016. iPad Pro 9.7″ users complained about bricking issues after the iOS 9.3.2 update after which Apple pulled the release for that particular line up. With iOS 9.3.3 beta 1, it seems that Apple still has not rectified the issue as the update is not available for iPad Pro 9.7″
If you were already on beta software, you should get the update via OTA. Check Settings > General > Software Update to download and install it. Alternatively, as a developer, you can login to Apple Developer Center to download the update in IPSW format and install via iTunes.
Ensure that your iOS device has sufficient battery charge before you start the upgrade process. Since this is a beta, do not try this on a device which is your daily driver.
It is not yet clear if Apple has included any new noticeable feature in this release. We will update this post if we find anything.