The Jelly Bean update started rolling out to the Sprint variant of the Galaxy Nexus three short days ago, but if you still haven't gotten it or are rooted and have been waiting to install it manually, you can now grab it directly from Google's servers.
Before flashing this, a couple of things need to be in order:
- You must be on the latest Sprint OTA (FG01).
- You must be running a custom recovery, have an unlocked bootloader with the stock recovery, or be rooted with a stock/locked device.
Once those requirements are met, you're only a flash away from jumping up to Android 4.1.1.
- mysidspr_FG01_to_FH05.zip (174MB)
There are actually three different ways to flash an official OTA package from Google, depending on your current setup: custom recovery, stock recovery with unlocked bootloader, or stock recovery with a locked bootloader and root access. Head here, find the instruction subset that applies to your device (near the bottom of the post), and flash away.
If you happen to hit any snags along the way, there's a running discussion thread going on XDA that should help you out.