The newest sets of binaries for Nexus devices have been published and are now available to download on Google's Nexus drivers page. This new batch of binaries is for Android 4.1.1 build JRO03R, and covers basically all Nexus phones and tablets:
As was reported yesterday, it looks like the Sprint Galaxy Nexus will, in fact, be receiving its upgrade to Jelly Bean. Finally. According to documents on Sprint's support page, the JRO03R build starts rolling out today. It looks like it will be an OTA update. If you want to compulsively check for it, though, you can do so in Settings.
We're still waiting to see if the Nexus S 4G will also get the promised Jelly Bean update, as we'd also heard.