Please see this page for Android Studio Stable versions.
November 21st, 2016: Android Studio 2.3 Canary 2 includes a few updates, bug fixes, and performance improvements.
Note: Android Studio 2.3 Canary 1 had issues in it's patching system, so a full download is needed when moving from Canary 1 to Canary 2. Android Studio 2.2.X should offer patches from major stable releases. All other users will need to download a full release to update.
The release is available in all channels, so you can check for updates via Help > Check for Update... (on OSX, look in the Android Studio menu). This will download and install a patch rather than download a full IDE image.