Android 4.2.2 also brings a couple of new sounds, The two short bursts that tell you that your battery is low has been replaced while there is now a sound for wireless charging. Previously, the latter had no sound at all.
as some devices get updated to Android 4.1. The large chunk of Android users sporting a device powered by Gingerbread is only going to dissipate slowly as those owners start to upgrade once their 2-year contract expires. Those Android 2.3 phones will be replaced by Android 4.1 by the time the updates are in full swing, providing another reason to expect Ice Cream Sandwich to continue to melt.
If you have installed the Android 4.2.2 update on any of your devices, drop us a comment with some of the other changes that you might have noticed.
source: AndroidPolice via GSMArena