Thanks to RootzWiki Developer jdkoreclipse, we also have a (mostly) working Jellybean build for the Verizon Wireless variant of the Galaxy Nexus. You'll be missing LTE and have to change a setting and reboot to get 3G, but it's your best hope to experience Google's Butter-y goodness this close to I/O.

Update: jdkoreclipse has ironed out the bugs, LTE is now a go!

Obligatory disclaimer: You are responsible for any consequences resulting from tweaking, rooting, or modifying your phone or tablet. If something out of the ordinary happens we can’t guarantee that it can be undone. Neither RootzWiki nor the developers associated with the contained ROMs, mods, themes, tweaks, or leaks are in any way liable for anything that happens beyond this point.

This is not the official and final Jellybean edition; this is based on a nandroid backup of the GSM preview build that was rolled out at Google I/O. There may be bugs, crashes, freezes, or other issues. The butter may leak out. Install at your own risk, and make sure to enjoy yourself when you do.

VZW Galaxy Nexus, Jellybean (Reverse-Engineered) Preview Build

Note: No new radio is included/needed with this build.

Download, Instructions, and Discussion Thread