Here's another one that requires a bit of creativity. There's another video that's circulating; in addition to featuring the aforementioned goat-demon thing, it also shows what appears to be a toothy chandelier. This could connect to Coven by way of Roanoke. To refresh your memory, FX released 26 teasers for season six, and 25 were misdirects. The last one, meant to confirm Roanoke as the theme, featured a chandelier of teeth. While teeth don't factor that much into the season, there are a few disturbing scenes featuring some dental horror.
Here's the connection: in Roanoke, we meet a monstrous she-demon known as Scáthach (played by Lady Gaga). Ryan Murphy has confirmed that this woman was the first Supreme, or more plainly, the first all-powerful witch to exist in the New World.
With the inclusion of this tooth chandelier in the Comic-Con exhibition, it might mean that the story of this original Supreme will somehow factor into the new season. Or maybe it's a sneaky way of inferring that the title of the Supreme in general is an important part of the plot.