Preview at WWDC likely in June, followed by September launch.
Apple Seeds Third iOS 9.2 Beta to Developers and Public Beta Testers
The new iOS 9.2 beta is available as an over-the-air update and through the Apple Developer Center. Today's beta is also available to public beta testers, and there's also a new version of the Xcode 7.2 beta available.
Earlier betas of iOS 9.2 introduced changes for the Safari View Controller, which is what allows a pop-up Safari window to be used in third-party apps. Safari View Controller now supports third-party Action Extensions, allowing apps like 1Password to be accessed in the Safari view of other apps like Tweetbot.
Safari View Controller has also been updated with the ability to long tap on the Reload button to reload content without content blockers and it now supports the request desktop site function. iOS 9.2 beta 2 improved Safari View Controller further, introducing support for dismissing it with an edge swipe.
Along with improvements to Safari View Controller, iOS 9.2 also introduces support for AT&T's NumberSync Wi-Fi Calling feature and includes bug fixes for iCloud Keychain, Apple Watch syncing and pairing, audio quality when streaming to stereo systems, and more.