The Android 4.2.2 Jelly Bean update is slowly rolling out to most Nexus devices out there. In fact, if you happen to own a Nexus 4 and/or Galaxy Nexus Yakju model (therefore a GSM international version) you should know that your Android 4.2.2 upgrade is right around the corner.
You’re looking for build JDQ39 which measures 51MB in size and should be available over-the-air, although it can also be manually installed by grabbing this link right here.
Again, you’re looking for build JDQ39, but you have to be coming from Android 4.2.1 build JOP40D to install it on your GSM Galaxy Nexus version. Here’s the download link that you’re looking for. If you have any issues you can always check the xda-developers threads listed below in the Source section for more support.
Have you upgraded to Android 4.2.2 already (here’s a changelog for this new Jelly Bean version)? Did you notice any particular improvements?