Google started rolling out Android 4.2.2 JDQ39 to Nexus devices later last night. If you have not received the update yet, you can now manually install JDQ39 on Nexus 10 tablets. Earlier, the direct download link for OTA update became available for Galaxy Nexus, now the Nexus 10 has joined the suite. Details are as follows:
How to Manually Install Android 4.2.2 JDQ39 on Nexus 10
Download Android 4.2.2 Nexus 10 OTA: eaef14432ff5.signed-mantaray-JDQ39-from-JOP40D.eaef1443.zip
Once you download the update, the process to install it on your device is same as for other devices. We posted a guide earlier that will let you install OTA update using CWM Recovery or Stock Recovery.
Follow the steps from this guide: Install Android 4.2.2 on Galaxy Nexus