Preview at WWDC likely in June, followed by September launch.
Apple Releases First iOS 9.2 Beta for Public Beta Testers
Beta testers who have signed up for Apple’s beta testing program will receive the iOS 9.2 update over-the-air after installing the proper certificate on their iOS device.
Those who want to be a part of Apple’s beta testing program can sign up to participate through the beta testing website, which gives users access to both iOS and OS X betas. Because iOS 9.1 was just released, it will likely be a month or more before we see the public release of iOS 9.2.
iOS 9.2 fixes several bugs in the operating system and it includes other under-the-hood enhancements. According to the release notes for the first beta, the Safari View Controller (the view of Safari you see within apps) is being updated with support for third-party Action Extensions that will let it more closely mirror the Safari app. It also includes options to reload content and request a desktop site, as in Safari.