Google has announced via Twitter that it will be rolling out Android 4.0 Ice Cream Sandwich to the Nexus Sstarting today. The GSM models of the device will be the first to receive the update, which will roll out in batches. The Nexus S was Google’s premiere Android 2.3 Gingerbread device that launched last November.

The update will be issued over-the-air and proceed to roll out to devices in waves over the next month. This means that some users of the Nexus S GSM version could be getting the update as early as today, while others may have a month to wait. Nexus S 4G users on the WiMAX network will have to be more patient.
And if you’re waiting for the update, you might as well check out Google’s tips for Android 2.3 Nexus S usersupgrading to Android 4.0. Some functions and features such as changing wallpaper, adding a widget to the Home screen, and scrolling through apps are slightly different on the new interface.