After being suspended for some time, Google has started rolling out Android 4.0.2 update for GSM Galaxy Nexus again. Update is 8.8 MB in size and is available OTA now.
If you are still on Android 4.0.1, you will automatically get a notification to update your Galaxy Nexus to 4.0.2 else you can also check by going to Setting>>About Phone>>Software Update.
This update includes important bug-fixes, so make sure that you update your phone. Do let us know in comments how this update worked out for you.