I know that the T mobile Nexus S got an official ICS update a while ago, not sure if all GSM ones did, but I know on T mobile it did.
"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it, Almighty God! I know not what course others may take; but as for me, give me liberty or give me death!"
-Patrick Henry, March 23, 1775