So, I think that Beth tried to implement lycanthropy and made some progress, but they weren't able to finish in time. Hopefully, if that's the case, they won't let that work go to waste and they will use it later on in DLC.
The article: http://www.9lives.be/games/elder-scrolls-v-skyrim/specials/elder-scrolls-v-skyrim-interview
Translated to English: http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.9lives.be%2Fgames%2Felder-scrolls-v-skyrim%2Fspecials%2Felder-scrolls-v-skyrim-interview&act=url