Great news follow by great news again. HTC has just announced some devices to receive HTC ICS Android 4 official OTA update, now the best phone of 2011 Samsung Galaxy S2 will also receive the official ICS update from Samsung thru OTA or Samsung Kies PC client. The update will be available starting from 1st March 2012 gradually thru OTA. The official ICS will come together with Samsung TouchWiz. There were alot of leaked or custom ROM are using ICS TouchWiz but it may not as stable as the stock ROM. You may interested to see some ICS custom ROM for Samsung Galaxy S2 here.
Custom ICS Stable ROM