I was reading about the new face recognition unlock of Android 4.0 and was just wondering that , if I should shave my head afterwards, the face recognition still would work ?
You can "recalibrate" face unlock by switching to another type of lock screen and back, as this causes a new reference image to be taken. Meanwhile you can unlock the device with secondary measures (either PIN or pattern unlock).
Yes it should work, Since the Face recognition technology in Android ICS is designed to match the face with the help of points of recognition as shown bellow.
Majority points will be applied on the facial parts. So it should recognize your face.