Vivien's baby is actually the Infantata.
Ben is actually Dead All Along.To elaborate, Larry whacked him pretty hard in the basement. And we haven't seen him any where else except inside the house since then...
There are actually two opposing forces in the house.One force uses the dead to try and create life, while the other uses the living to try and kill the females to keep the other force from procreating. The first force retaliates by trying to keep the males out of the house.
Violet will be the Final Girl of the first season.In horror films, the final girl is always a young, terrorized ingenue who is somewhat savvy to what's going on around her, at least compared to the other characters. And this is especially true in Violet's case. Plus, it doesn't hurt that Violet has Tate, one of the house's spirits, on her side.
Vivien's twinsOne is a demon, and the other is Ben's, setting up a final battle between good and evil in Murder House.
Tate didn't save Violet in time when she overdosedAnd she's now a ghost in the house too. This is why she hasn't been in school for two weeks and hasn't left the house.
Tate's going to try to kill VioletSo that she will stay in the house forever with him (If Violet is still alive, that is).
Moira will not find peace when (and if) her bones are foundAfter all, Chad and Patrick are still ghosts in the house, and their bodies were found. What makes Moira think she will be allowed to leave the house if her bones are found, when (and if) the gazebo is removed? Would bet on her becoming the Big Bad of the series if she finds this out (she won't be happy, in spite of her very calm and polite demeanor)
Ben and Constance will die in the season finale.In which case the Harmons could be reunited as a family, albeit a ghostly one in the house. It would make sense - No one can escape Murder House. Tate will most likely end up killing Constance.
Both of Vivien's twins survived.Charles Montgomery lied about the first child being stillborn. Right after he says it, we see Nora being secretive. The baby we saw is actually Ben's child, and while everybody's fighting for it, the ghost baby will slip right under everyone's noses.
Dr. Montgomery made a deal with the devil.The Antichrist will be conceived when a male ghost has sex with a living woman. Itís a grotesque parody of Christís conception by the Holy Spirit. The house is a good place for that to happen, since itís a ghost trap. Everyone who dies in the house stays in the house as a ghost. Dr. Montgomery had the house built for himself and his wife to live in. The house is a ghost trap because Dr. Montgomery had it built that way. He did that and knew how to do that because it was part of his deal with Satan. The Devil gave him the secret of bringing back the dead in exchange for building the house the way the Devil wanted it. Unfortunately, it was all so horrifying that it drove him into drug addiction and madness.
Bianca and the patient from "Piggy, Piggy" had a limited form of clairvoyance.Billie Dean described clairvoyance as a "different gift" from her own, implying that clairvoyants do exist in this world. Both Bianca and the man from "Piggy, Piggy" were obsessed with a vision of the circumstances of their own deaths which turned out to be true, even if the details were different.
Moira's true form is her younger selfPeople are probably wondering why, if ghosts get to choose how they look and appear— why Moira has "young Moira" and "old Moira". Some people think it's because men see her differently because that's how men view women — but Moira has young and old Moira because she has chosen to look old for women. She was killed by Constance who saw her being raped and interpreted is as her seducing her husband — Moira's young form is naturally beautiful so she goes as an aged ghost for women so that they won't get jealous or suspicious of her. She's deceiving the women, not the men. Her true form is a young dead girl.
Tate kills Chad and Patrick to save the baby.Nora has always wanted a baby...maybe Tate just didn't want the child Chad and Patrick were planning to adopt to be "adopted" by her
There is a force around the murder house and the property that prevents Shachath from entering and escorting the murder victims to heaven or hell.