This is a pre-release version of iOS 9.2 for iPhone, iPad, and iPod touch. Devices updated to iOS 9.2 can not be restored to earlier versions of iOS.
Previous builds of iOS 9.2 beta have brought support for AT&T NumberSync, an improved View Controller for Safari, and Arabic Siri support.
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Apple has seeded a public tester build of iOS 9.2 beta 4 as well.
Developers can download the new build from the link below...
[Image via @iPhonedo]