Mine shipped with ICS v4.0.1 and there was no Face Unlock option among the Screen Unlock options (just as Chris described in his cellphones.ca question). I guess an update to 4.0.2 or 4.0.3 will solve the mystery.
(4.0.4 just came out a few days ago, but it is reported to have serious issue with losing connectivity while in sleep mode ... so it's probably a no go for me)
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Bootloader unlock did it