SPRINT Galaxy Nexus Jelly Bean 4.1: How to get the update NOW!
Before any of this, check for an update by selecting About Phone in Settings, and select System Update. You may have the update already. Check Now. If not, follow these simple instructions to get the update NOW!
Open the Settings application.
Select the All drawer, and select Google Service Frameworks.
First, Force Stop the application, then Clear Data.
Now that the Google Service Frameworks are reset, you may check for an update, by selecting About Phone in Settings, and select System Update.
The last update check should be garbled. Around 1969.
If this did not work, try these steps several times. This is important, IT MAY TAKE SEVERAL TRIES BEFORE A RESULT.
Enjoy Jelly Bean on your Sprint Galaxy Nexus. I will.
Oh, please comment if this is sucessful, let others know the validity of this post.