I wonder if any of the civs will have a unique district to replace the government plaza since the reflecting pool and central circular courtyard area seem like a likely spot to place some unique structure. It would need to be a particularly special plaza with some recognizable structure since you can only build one government plaza. Something like the Augustaion for a Byzantine civ with the pool and courtyard being replaced with the Hippodrome, for example (and in this scenario the district would incorporate some mechanic to help the civ withstand dark ages, as a reference to the Nika riots).