About a week after the Takju variant of Samsung's Galaxy Nexus got its 4.2 update, it looks like the same is rolling out to the Nexus' Yakju variant. The update (build JOP40C), for those not willing to wait, is also available for manual download and flashing (check the link below).
It should be noted that this update is meant solely for the Galaxy Nexus Yakju – that's the international version not from the Play Store – and your device should be running build JZO54K before you try to install the update.
For those interested, Google has also posted Yakju's 4.2 factory image here.
If you're tired of reading and ready to manually update your Galaxy Nexus, the process is simple. If you're running a custom recovery just download the zip, move it to your device, and flash as usual. If you've got stock recovery, grab the download below and keep reading.
Reboot your Galaxy Nexus, holding the Volume Up and Volume Down buttons while it boots up. Once you see the fastboot menu and "Start," press Volume Up to navigate to "Recovery" and press the power button. Once you see an Android with a red exclamation point icon, press Volume Up and the Power button together, which will bring you to a new menu. Navigate to "apply update from adb."
Connect your Galaxy Nexus to your computer with a USB cable.
Make sure you have a recent version of adb that supports the sideload command (if you don't, download the latest Android SDK to ensure your adb is up-to-date).
Open up a command prompt (cmd in Windows, regular shell in Linux and Mac) in the same directory as the JOP40C zip file you've downloaded.
Type in the following:
adb sideload fdf06e8d71c7.signed-yakju-JOP40C-from-JZO54K.fdf06e8d.zip
You should see a progress bar, which will eventually hit 100%. At this point, your device is installing the update.
Reboot and enjoy! You are now running Android 4.2 on your Yakju Galaxy Nexus.
Download: Yakju Build JOP40C