Thats a good question. Everybody but the developers can only speculate about the answer at this time. If i might do so, i'd say that the odds are high, that potatos might find their way into the game. But i could be wrong as well. Time will tell i guess.
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Dairy, potatoes(sugar beats) and other farming activities could come as DLC's. It would complicate multiplayer a bit due to you and your fiends need to decide uppon what DLC's to get, but it's either that or free updates.