The official OTA update to Android 4.2 for the Sprint Galaxy Nexus has just hit Google's servers, and you can grab the build (GA02) right now. Here's a direct download link, originally found on XDA. Sextape at SXTP Developers posted yesterday indicating that a leaked version of this build would end up as the final OTA release. Here's the detailed build info:
File size: 102,838,616 bytes
So, now you're wondering how you go about flashing this build, right? Well, you can do it now, but it's not a one-step affair. I've placed instructions below, but proceed at your own risk - the OTA update will probably be going out through Sprint fairly soon, too. But hey, sometimes you just need it now, right? If you're using a custom recovery, you can proceed as usual and just flash the ZIP file (assuming you're coming from build FH05). If you're running the stock recovery, you'll need to follow these instructions.
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 JOP40D zip file you've downloaded.
Type in the following:
adb sideload c5ea6e959840.update_mysidspr_FH05_to_GA02.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 Sprint Galaxy Nexus.
Android 4.2.1 (JOP40D) for Sprint Galaxy Nexus from Google.
Update: We've uploaded a mirror just in case.