They said they don't want to make any new races and adding a different body type to an existing race would require pretty much the same level of modelling work as adding a new race.

The issue is that each piece of gear added to the game needs to be adapted to fit every different model/skeleton type. That means that each race and each gender of each races requires separate work. If you add one race with two genders your increasing the workload for every item by two. It makes it harder and harder to add new items.

This is the reason they aren't promising adding the other genders of the new races yet. They need to figure out how they will manage the additional workload. Beyond that, I seriously doubt we will see any new model types for playable characters for the same reason. They are close to the limit of what they can manage at the moment and adding more will just mean we get less for what we already have.

New face and options for the existing customisations might be a thing that could happen though.