I'm thinking yes, for Vampires, and Werewolves.
If they weren't in, they'd have probably said so by now.
It's not really wise to let so many ppl think, they might be in, then say no right before the release. That would surely cost them sales. (ie, saying so earlier would give ppl a chance to get over it, and maybe see something else they like about the game, etc,. Regain interest, etc,. Release day sales are very important to game companies, mainly for investors, and whatnot.)
Even more than in, with the number of joinable guilds being so low, I'm thinking they may actually have good quest lines for the Vampire clans, and Werewolves, etc,. (Hopefully as good as the Dark Brotherhood, which is possible given a comment Todd made about the writer for that quest doing a lot of Skyrims quest.)
Then again, maybe I'm just being optimistic for a change.