I thought this was the finale too. Oh well.
So stuff happened. In fact so much stuff is happening there won't be much mystery left for next season. I liked the Roanoke segment; the actual ghost stories are my favorite parts. The rest of the show in present day is in danger of becoming Ghosts of Our Lives. It's far removed from the paranormal mindf**k that was in the first few episodes now.
I have figured out the purpose of the house however. It's forcing the spirits to assemble it's own on-call service team to keep the household running! So far we know it's recruited doctors and nurses, home decorators, a pest controller and a maid. Maybe it's already managed to acquire a plumber, cable TV installer, carpenter and IT guy. Next year we might see those and a roofer, glazier, chef, mechanic, piano tuner, gardener ... added to it's employee list.