yeah actually I lied. That article I read was bogus.

I read the other articles about the clue being in episode 11. While I didn’t see a specific frame insert, I noticed a lot of farm references. The baby room was painted with farm animals, the cribs were painted red and white, like a barn. Later, there was a wooden watermill on Violet’s desk. In another scene, when Vivien walks in the house in labor, there was a cowbell on the door behind her. When Ben tried to call 911, there was a bowl of eggs right by the phone. The mobile over the crib was composed of farm animals.
So my guess for next season’s theme is in a farm/rural area.