Confirmed that this update is for an Apple screwup where they accidently deleted or left something out of the original 10.7.4 combo update:
http://afp548.com/forums/topic/silent-10-7-4-combo-update-change/
That may be why only certain people are seeing it. It may only affect those who used the combo updater or a fresh 10.7.4 install.
http://afp548.com/forums/topic/silent-10-7-4-combo-update-change/
That may be why only certain people are seeing it. It may only affect those who used the combo updater or a fresh 10.7.4 install.