So what has changed for vamps?
New interactions; one is an extremely funny one called "Enthuse about Plasma" or something, and if a Vampire sim does that to ANOTHER Vampire, they toast Plasma boxes.
Others that I can't remember yet: I don't get the game until tomorrow, but I've seen a million reviews, guides, photos, walkthroughs, and the like.
The Sunscreen spell so Vamps can go outside (side effect is sparkly Edward Cullens
) and better looking vampires.