Potionmaking III and Bureaucratic Arts III have been in the Encyclopedia for ages.
Staff never really confirmed if they would exist. Players just speculated. It seemed likely, but I start to doubt it. Not much use for them now, maybe Party Permits and permits for houses etc. but that's all speculation.
There have been images of other potions, like the xp potion, but not sure if they'll be actually brought into game.
Many images for skills have been uploaded for many months, even since beta, but never released. Drafting, Construction, etc. But they seem like they'll just be old images forever; replaced by newer things like Furnituremaking. Furnituremaking and Fox Brushing were never images until they were actually released.