Android 4.2.2 isn't quite official yet, but it's slow roll out has been bolstered by manual download links and folks are finding a few new things in the latest firmware. Most of it is behind the scenes and will be covered by words like "stability enhancements" and bug fixes, and those are what's really important. A specific that folks are reporting is a fix to the Bluetooth stack to fix audio stuttering, and that's something folks have been waiting for. Equally important is that plenty of people are saying their Nexus devices are no longer randomly rebooting, so if you have an issue there hopefully Android 4.2.2 fixes it.
There are some other user-facing changes that probably won't apply to anyone without a Nexus device. Once a manufacturer gets their hands into the code, they tend to change these types of "features" to something that fits in with their version of Android a it better. Often times their version works better than stock Android, so we're not going to complain that they get changed. Here's what folks using stock are seeing:
- When connecting via adb to a computer for the first time, you're prompted to allow the connection. This small security enhancement will help keep your bootloader locked device safe if you lose it. [Android Police]
- App download notification have been changed. Now you'll see a progress bar that tells you the time remaining in addition to a percentage downloaded. [@ssaig]
- Quick settings have been enhanced. Users can now long press on the Wifi and Bluetooth icons to toggle the setting. [@NittyMDev]
- New sounds for wireless charging initiation and low battery alert. Users will now hear a notification sound when the device is placed on a wireless charger. In addition the low battery sound has been changed. [Android Police]
Removed option to show all calls in the phone app's call list.
- Vibration for notifications is longer in duration
- New Gallery app animation allows faster loading. [@ssaig]
Really, nothing there anyone would miss if Samsung, HTC or any other manufacturer decided not to implement it. In short, 4.2.2 sounds like the bug fix update everyone has been waiting for. These kinds of updates are the ones we like seeing!