Two ROM developers located in the AndroidCentral forums have taken the Face Unlock capabilities from the Galaxy Nexus and built it into a nice Android 4.0.3 AOSP ROM for both variants of the Nexus S. Giving you guys the luxury of all that is ICS.
Be sue to read all the install instructions before hand and know that you flash any custom ROM on your own. We, nor anyone else, will accept any responsibility for any damages you cause to your device. With out further ado, head to the link that is for your device and grab the ROM if you are so inclined.
Download – ICS with Face Unlock for Sprint Nexus S 4G
Download – ICS with Face Unlock for GSM Nexus S
Let us know how it goes and if the Face Unlock is everything you expected it to be.
Source: AndroidCentralÂ