So this is the big mistery so far... we know that Lange is the main witch, Bates is a serial Killer and Basset a master of vodoo, and acording to the plot of "Bitchcraft", the vodoos are the enemies of the coven. I am assuming that all the characters shown in the las teaser are the ones who in some way are related to the house, but where is Frances Conroy? She was announced as a major role in this season and the only info that we have is that her name is Ruth and she has some kind of rivalry with Fiona (Lange's character).
So... rival is someone that could, in a way, equal you as an oponent, but those that mean in the same area? Maybe she is a rivel to Fiona, but not in witchcraft, maybe she is some kind of very religious person, that know Fiona's secret and has some kind of influence. And knowing that Murphy is very good doing references to past classic movies, the character of Conroy looks a lot like Carrie's mom from the movie Carrie (http://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/v2_article_large/public/2013/09/01/american-horror-story.png) a known religious fanatic.
So what do you think?