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Firstly there is a new notifications bar which shows the time remaining and the percentage left of an in-progress app download. The Quick Settings panel has been updated to include the ability to long press to toggle Bluetooth or Wi-Fi ON or OFF. Strangle the toggle for Airplane mode only requires a single press and tiles like the data tile don’t have the toggle function at all.
The update also adds a new new system sounds, including one which indicates when the battery is low and a new sound for wireless charging. Wireless charging didn't have a sound assigned to it previously and it now comes in time for Google’s release of the charging orb for the Nexus 4.
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Have you installed the Android 4.2.2 software update on any of your Nexus devices? If you have drop us a comment on any of the other changed you may have noticed.
source – Android Police