After Nexus S ICS update, Galaxy Nexus GSM version has also started getting the Android 4.0.2 update, which was released for LTE version recently. This update is 8.7MB in size and reportedly includes important bug-fixes.
There is no change-log available right now, but it might be same as the LTE version change-log apart from the LTE fixes.
It is being pushed OTA, and has only reached select users till now, so it might take a while before heading your way. So just sit tight and we are looking for the update download link to get you the the manual instructions.via XDA