Use this tag for questions related to features that are specific to version 2.2 or features introduced in this version.
Android Studio 2.2 is now in the stable channel and can be downloaded here. A list of new features and other release notes can be found here.
The first preview was released on May 17 2016 during Google I/O 2016 to showcase some newly presented features for developers to try out. It had been extensively tested through 7 previews, 3 betas and 2 RC's before it was released into the stable channel on September 19 2016.