I don't think "unlock" is the right term. They have to re-design each hampen set for each race. The models were made for each race specifically. There is no magical button that will make the female roe set work on female au ra or such. Basically they have 6 models per gender that they have to re-create five more times ... That makes it 60 sets for both genders? (if my math isn't off due to lack of coffee in this hour) I can see why this isn't in their priority list.