As long as your character's skin doesn't become sparkly, then we're golden.
Here's a 'confirmed so far' list, for all those who are interested.
elderscrolls.wikia.com/wiki/Fact_List
Sadly, werewolves are confirmed as not being in Skyrim. Damn shame, but I guess at least this way we won't get packs of half naked boys chasing us through the woods and calling us Bella. My Nordic hardarse would find that quite disconcerting, to say the least.
Werewolves are in the game. I managed to watch a stream and the chance to become one is there, as well as vampires.