The Android 4.2.2 roll-out process has started this week and users of the LG-made Google Nexus 4, Asus-made Nexus 7, Samsung-made Nexus 10 and Galaxy Nexus are receiving their OTA notifications as we speak (or are already enjoying the point update on their devices).
Android 4.2.2 factory images are up for anyone to grab for the devices above. Make sure to download and save them in a safe place as they’ll help you revert to stock should anything you do on your phone result in unwanted results. Also, those who have not yet received the OTA notification can head over to the source link and download the appropriate files.
Source: Google Developers