Sprint as announced the availability of Ice Cream Sandwich for the Nexus S 4G this afternoon. The version will be IMM76D, and it has the same 4.0.4 features as we've come to expect from the GSM versions of phones running it. Sprint hasn't gave an official timeline for when to expect the rollout, but we would suggest checking right about now to everyone who has been waiting. And don't forget -- if you get the update notice, hit one of the developers or forums advisers before you click anything if you want to help the community out by providing a download link.
For help getting back to stock, preparing for the OTA, or any questions about getting Ice Cream Sandwich on your NS4G officially, just hit the forums and holler.