Then I looked at the screenshots. Reflections in the mirror? Sunlight streaming through the windows? These aren't vampires, they're the folks that shop at SimHot Topic.
But hey, The Sims 3 isn't due on PC until June 2. Maybe there's still some hope yet.
Update: Electronic Arts has clarified that while players can indeed make a Sim that appears to be a vampire, they cannot actually play as a vampire in the game.