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Season's three storyline
Misty is the new Supreme
Related to the above WMG — Fiona isn't seeking to prolong her youth.
Stevie Nicks will appear
Nan's the next Supreme
Why is Hank Foxx so accepting of his wife's witch status?
The Ramseys are witch hunters
Madison was not the next Supreme
Spalding is Cordelia's father
Zoe is the next SupremeIt's almost too obvious to be true.
Myrtle threw acid on CordeliaBlinded with rage, she wanted to get back at Fiona somehow.
Joan threw acid on CordeliaCounterpart to the above WMG, and related to the Witchhunter idea.
Hank is posssessed by a demon that hates womenHe was possessed by a demon during his fertility ritual with Cordelia in 3x02 and the demon is using his body to carry out some kind of misogynist murder spree.
Hank is a Witchhunter
Hank is an assassin
The Doctor has something to do with the acid thrown at CordeliaHe's in the hospital and talks to Fiona twice, trying to help both of them. Maybe he's not the bad guy here, but it's a little odd how he appeared twice and talked to Fiona. They could have just used another actor for episode 6, but they chose him.
Madison WAS the next SupremeCordelia lied about it to save Fiona's skin.
Not only Zoe is the next Supreme, but she will become much alike Fiona by the end of the seasonAs something of a tragic story. Zoe will lose her innocence (she already is) and become more cynical. She already has a disturbing minion in the shape of Kyle.
Fiona will give her life for CordeliaShe's already made it clear how much she cares for Cordelia. It'll be her moment of redemption. Probably during a fight with Marie Laveau.
Myrtle and Luke belong to the church that burned MistyIn fact they are her mother and brother.
Delphine will make an alliance with the CorporationSomeone took pictures of Hank's body in Marie's salon, so someone must have been there to check everyone had been throroughly killed. Delphine's body and talking head are found, and after she pleads that she was cursed and only wants to die, she offers to give intel to the hunters on Marie and the witches from Miss Robichaux. They rebuild her, also?
Nan will kill Luke's mother.As the YMMV page may mention, Nan is the only one not to have killed a person with seemingly no guilt, along with Cordelia. Since it looks like Joan was trying to kill her son, it might be the breaking point for her and she loses her innocence.
Joan will kill Nan.She is the only one that isn't mentioned in the 3x11 or 3x12 synopsis, and in the 3x11 synopsis it's said that the Coven will mourn one of their own, not to mention her actress seems the only one not to be at the funeral mentioned above. Plus, the synopsis says that Nan will confront Joan about Luke's death, and seeing as the woman was crazy enough to kill her son right there in the hospital it's definitely not going to end well.
Queenie is dead, but will be back as a ghost.The line about Cordelia having to appease an angry Queenie might be because she is dead and in ghost form after being shot by Hank.
Cordeliais the Supreme. And the heartbreaking task she will have to do is kill her mother so she can rise as the new Supreme.
Fiona is still aliveFiona created a false memory or vision for Cordelia to read from the Axe-Man so that way the Supreme candidates can be narrowed down during the Seven Wonders and she can kill whoever passes all the tests and is determined as the next Supreme.
Hank was originally supposed to be played by Dylan McDermottBut they couldn't get him back for whatever reason. It would make sense, as McDermott was in the previous two series while Josh Hamilton is only a newcomer. Also: all the meta-level Squick of having McDermott going from playing Sarah Paulson's son to her husband.
Fiona swapped bodies with Myrtle. In the episode 'Go To Hell' there's a reference to the movie The Skeleton Key and maybe Fiona took a page from that movie and swapped bodies with Myrtle and is planning to watch the Seven Wonders test and then swap bodies with the next Supreme, whoever she turns out to be. The idea that it's Myrtle she swapped bodies with comes from the fact that Fiona was taken by surprise by the Axeman when he killed her as if she had just been there, and spoke her last sentence in a Myrtle-like way. Also, Myrtle is the only one who isn't dead in Cordelia's vision and isn't seen, so maybe when Cordelia sees Fiona as the killer she's seeing her actual face, not the body she hides in. It's a reach, but what if?
Kaylee is the Supreme.Maybe she wasn't killed when Hank shot her, or at least, she didn't stay dead. She had pyrokinesis, maybe she gained the ability to resurrect herself, like a Phoenix?
The Supreme is going to be a male character.Everybody says that 'nobody will expect the new Supreme' but so far everyone is expecting it to be one of the main female characters, even including Myrtle. The Supreme being a male character would definitely be unexpected, and it's not like this season didn't show us that RM isn't above using Shocking Swerve endings to storylines.
Misty can still come back.She survived being burned at the steak. We don't know if her body was intact or if she was completely ash. (Granted, the fire would have to be really hot, but there's no reason to assume they didn't keep at it to cover their bases. So she could one day break out of her hell, and create a new body, rising from the ashes. As for why she could bring herself back without a body, and not others? Because bringing herself back is integral for her survival, and reviving others is just a courtesy. I know I'm reaching for it, but please.
Misty is the Supreme, but for the next generation.She'll come back from her personal Hell just as the previous guess said, but only after a long, long time has passed. And her coming back from Hell would mean she succeeded in Descensum, albeit in a different way than it would normally be done.
Myrtle was hoping to kill Madison during the Seven WondersThe tests normally go from easiest, to deadliest. Considering Divination came near-last and the worst Vitalum Vitalis seems to be is that you can't perform it, possibly trapping a person's soul with Descensum seems like something that would be reserved for the finals. My guess is, she was hoping to kill off Madison as fast as possible, due to her being a threat to the other witches' safety, and for that stunt with Kyle. If she succeeded, then they could do the rest of the competition without her. If not, at least they would be through another Wonder. If another witch died, it was a loss that would have probably been inevitable should they have reached the point where they had to perform Descensum again.
Stevie Nicks has the power to curse people with bad luck.Notice how, after she wishes Misty (and later, her and the rest of the girls) good luck, something majorly bad happened to Misty? Stevie Nicks is also a friend of Fiona. She's using her powers to help kill off the coven for her ally.
The season is a scathing critique on modern feminism.The witches are divided against each other, reflecting feminist views (like misandrists, Trans-Exclusives, radicals, and other variations.) The (mostly male) witch hunters represent people who are against feminism - some have good reasons for opposing them, like the fact that many pose a danger and shouldn't have so much power when they abuse it; others are just hateful and intolerant. The inherit issue with Fiona being Supreme is to show what modern-day womens' rights are when under a leader who is out of touch with society, and cares more about what she wants that what's actually good for her followers. Lastly, Cordelia represents an idealized feminism, where they are not kept secret and have allied themselves with the rest of the world. They opened themselves up and got much in return. And she leads with kindness and love, rather than wrath and force. Sure, there could be problems down the line. But in the long run, she made everything better for the entire world.