If you happen to own a Galaxy Nexus from Verizon, there is a pre-release of the Android 4.1 Jelly Bean operating system update available at the moment, but you will need to do your fair bit of homework before you are able to get your Galaxy Nexus up and running with some Jelly Bean goodness. For starters, you will need to make a return to stock 4.0.4/IMM76K, followed by unlocking the device and installing a custom recovery (ClockworkMod or TWRP will do). Once done, just flash the IMM76Q package using custom recovery, followed by flashing the JRO03O update via the same route as well.
Bear in mind that this operating system update has not been certified by the folks over at Verizon Wireless, so you will need to unlock your bootloader beforehand as mentioned. As usual, it makes perfect sense to perform a backup of all your data beforehand lest something goes awry as you can never tell when Mr. Murphy is going to come knocking on your door.