I've noticed that most of the Space Marine, Chaos and Eldar cards have a chapter/craftworld affiliation trait (also most of the "fan" Imperial Guard cards and Straken). That is cool and leaves the way open for super cool combos and card trait synergies. But for the remainder, Dark Eldar, Tau and Orks, they don't have any kabal/caste/clan trait. Even the powerfull warlord Nazderg, whose flavour text mentions his Bad Moon clan, don't have any of those traits.
Please don't leave those races as plain standards, while others get Ultramarines, Blood Angels, Dark Legion, Alpha Legion, Alaitoc, Biel-tan, Iyanden, Catachan or Vostroyan flavoured themes.