We are hearing rumors that some users of Nexus branded gear have started to received the 4.2.2
Android update. Some readers have asked how to check for OS updates on their Nexus 7 but it will be the same for Nexus 4s and Nexus 10s.
1 - Open Settings
2 - Click on About Tablet
3 - Click on System Updates
4 - Click on Check Now
If an update was available, you would see it listed here, with the changelog and the option to download and install the update.