The Samsung Galaxy S II for AT&T is receiving the Android 4.0.3 Ice Cream Sandwich (ICS) update again through the Samsung Kies software. The update was previously released for the AT&T device and subsequently removed citing that it hadn't been properly tested.Now users are reporting that the update is once again available. However Samsung has still to make an OTA (Over-the-air) update available and any use who wants to savor ICS will have to update the old fashion way – through USB.
Hopefully the OTA update will be available soon.
source – AndroidPolice