Google today announced that it has begun to push out its Android 4.0 update for the Google Nexus S.
We’re rolling out Android 4.0, Ice Cream Sandwich, to GSM/UMTS Nexus S devices over the coming month, starting today:
As Google indicates, the deployment will be gradual with GSM/UMTS models getting the update first within the next month.
To check if your update is ready, check under Settings > About Phone > Software Update.
Google has yet to provide deployment timelines for the CDMA version of the Google Nexus S.
Source: Twitter