A rural or rustic theme could work for either of fairies or werewolves, But I think fairies have more 'wiggle room' to fit other themes too, and I could see them being in a pack that was somewhere between the Eco and City packs in the design of any new zone it added - urban fairies. They'd fit there just as easily as they would in a series of hidden zones found through trees like the one in Willow Creek.
Dragons would have scaling issues and seems too far off scope of Sims.
If they put the were-creatures in another Japan like setting they could include a number of animals in a rustic environment. Mostly foxes and cats though.