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:

post-build=samsung/mysidspr/toroplus:4.2.1/JOP40D/L700GA02:user/release-keys

md5: 4a023ce78c17c8256dfec8ae0615707f

File size: 102,838,616 bytes

So, now you're wondering how you go about flashing this build, right?