The Thebes, Troy, and Mycenae maps are really neat and the unique building effects are quite fun. Personally, because it's a victory condition city (and it's really cool), I'd like to see them add a map for Knossos. Like Thebes has a unique tier five building Knossos could be given a tier five building like the labyrinth or something else referencing Daedalus, the cities architect. I could potentially see what ever building being minotaur related building that lets you have two or more minotaurs and buffs them like Thebes buffs Spartoi. Lots of potential.
I could see these in game.