No doubt Keri Hoskins was hot. A lot of us thought "blueberry and lime" was going to be Sonya and someone else but we got disappointed. However NRS reads the forums and I imagine they will consider adding a classic skin of Sonya.
I don't think NRS is ever going to put the work it takes to make a new skin into one that can't be shared among multiple characters. That means ninjers, ninjers, and more ninjers.