Chevy Cam has released his latest version of Steel Droid Jelly Bean for the Galaxy Nexus! This latest build does feature the latest Radios and Bootloader JRO030 which will improve on signal and reception as well as include some other bug fixes. This is based on VanirBean and includes the latest Popcorn Kernel v11.8 which means this Rom flys! The playstore has been updated, Google Now has been updated, SuperUser, and Google Music have been updated. Other custom mods include Brightness slider, backlight level settings, Safe headset volume option in settings, status bar clock customizations, custom lock screen target settings, as well as other custom theming and more!
To properly install this Rom you will need to Download the Rom and the Bootloader/Radio files. When in recovery wipe data, wipe cache, wipe dalvik cache, then install Rom, then install the Radios and Bootloader. Then you can safely reboot the phone. If you decide not to install the new Radios/Bootloaders you may encounter a bootloop. I would suggest just flashing them directly after flashing the Rom.
More info and Rom Download here