User blog comment:Blood Reaper/Skyrim: Confirmed Creatures/@comment-4228635-20110731233815

For those of you interested in vampires = http://elderscrolls.wikia.com/wiki/Volkihar_Clan

And I believe werewolves would fall under this = http://elderscrolls.wikia.com/wiki/User_blog:Kacj321/Skyrim_Fan_Interview

"Will the character be able to change into certain creature?

Todd: We’ve done various things like that in our previous games, and it’s something that we probably won’t be talking about specifically on this one. Don’t read anything into that, we just prefer to not discuss this one. We’d like to leave that an open question until the game is out."