There's only 1,000 of them, right?Ultramarines appear to be involved in every ongoing struggle in the 40k universe, which should be physically impossible. It would blow my mind if they made a boxed set with Carcharodons or Novamarines, they're out risking their asses just as much as the UM, but you'd never know it.
Remember when a lot of the promotions were focused on the player making their own army and they'd pick out different obscure ones in the fluff just for examples and ideas? Like when the face of Chaos for the product catalog was the Red Corsairs instead of the Black Legion?