If faces change to a softer shape--I think it might have to do with the male attraction to childlike faces. Hardwired for the fecund and the nubile--and might go a long way towards explaining the intractability of the seduction of the adolescent. Yet again, in this article, the muddling-up of selection for type and "evolution."
I don't even know if this is 'genetic' as much as it is the change in diet and lifestyle changing the way our bones and teeth develop.
For instance, if at birth we dropped an infant in a culture that rarely cooked and didn't eat farmed food, maybe the jaws and teeth would develop to match the 'old' human structure.