User blog comment:G0LD3NF1RE/Werewolves Appearing in Skyrim/@comment-2219755-20111104140544

I think that they were originally going to be in the game, but where scrapped because they ran out of time and are now going to be in a DLC similar to Bloodmoon, seems the logical answer to me, if we go by the original statement about werewolves not being in the game.