I got a feeling that the plan for dlc is based on selecting a specific group based on region. The Khitai represent the East and Aquilonia are representing the West. If this is in fact the plan that leaves representatives from the North and South. Give that the two current dlcs are based on races on the character selection screen, then that leaves the Kush for the South and maybe the Cimmerian for the North with a tribute to Atlanteans, Am I on to something?