My two opposing theories go like this.
A: because there is a european area of the game, Bethesda will feel comfortable with Spicing up the other buildings in the world.
or
b: Because Only high rock is Lorewise very european (Cyrodil is also fairly european) Bethesda will ensure that every country in the game has a generic town with generic buildings, or Perhaps every town will be European with a small variation in design so that the Defenders of bethesda have something to defend.