October 19th, 2016: Android Studio 2.2.2 includes bug fixes and performance improvements.
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.
In Android Studio 2.2, you may have noticed the larger download sizes than previous versions of Android Studio; this is because we now bundle a build of OpenJDK with the IDE to address various font rendering and stability issues.
Edited update: A few checksums did not update correctly, They have since been fixed.