JZConcepts.com, the homepage of LucasArts' concept artist James Zhang, has a hidden folder that contains concept arts from "Star Wars: Knights of the Old Republic III". They could belong to either a canceled project or a current one.
If you inspect the front page of JZConcepts.com and click on his "Client List", you will find out that James Zhang's clients include LucasArts, LucasFilm, Miramax, Sony Online Entertainment, Vivendi Universal, Epic Games, and other high-profile companies. Zhang also worked on titles such as Kill Bill (movie), Deus Ex, Unreal Tournament, and various Dungeon & Dragon and Star Wars products.
Courtesy of the uncovered concept arts, we now know the names of these characters in KOTOR III: Dashaad (could be a faction or specie), Idriss, Naresha, Q10 (could be a droid model), and Vargas.
For copyright reason, the concept arts are not attached here on N4G. If they are removed, please refer to Alternative Sources.
Update You can conveniently view all the artworks as thumbnails on a single page at the first Alternative Source.