A week ago we brought you news that Android 4.0 Ice Cream Sandwich had come to Samsung’s Galaxy S II Skyrocket thanks to a leak. The leak allowed Skyrocket owners to get their hands on the latest and greatest version of Android. Though Ice Cream Sandwich will probably be coming to Galaxy S II smartphones in the US eventually, Samsung has declined to say when, despite having begun updating Galaxy S II phones in other countries.

Now it looks like another leak is bringing Ice Cream Sandwich to certain phones a little early. According to a report from BriefMobile, Ice Cream Sandwich for the Nexus S 4G (Sprint’s version of the Nexus S) has been leaked. Given that the report is dated yesterday, you might be inclined to think it’s an April Fool’s Day prank. Fortunately, BriefMobile is kind enough to specify from the beginning that “This is not an April Fools joke.” They offer a link to download the ICS update files and instructions for installing it. They also include a handy (if slightly alarming) disclaimer warning would-be updaters that installing Ice Cream Sandwich will wipe their phone’s data, and disclaiming liability for users’ actions.

There is no word on when an official release of Ice Cream Sandwich will be coming to the Nexus S 4G. The GSM version of the Nexus S got the update a few days ago, so it’s a safe bet that it isn’t too far off. For those who can’t wait, though, BriefMobile’s got the link’s and a guide for installation. If you get it, let us know how it works in the comments.