It does seem as though this Android 4.2 Jelly Bean update is meant for folks running on the GSM version of the Galaxy Nexus, mainly the ones ordered straight from Google themselves. Obviously, installing this update might not mean it will run smoothly and you will live a long life, as things can still go awry as you can never quite tell just when a particular Mr. Murphy is going to strike. Best to wait for the official Android 4.2 Jelly Bean update as always unless you are a gambling man. After all, not everyone wants to brick their handset for no particularly good reason.