For the third age scenario we will have no city states as I would prefer everything be playable, the 18 civs we decided partly based upon how unique they were from each other in terms of positioning, objectives and other things (this is for the scenario). But they are: Gondor, Rohan, Mordor, Gundabad (/Orcs of the Misty Mountains), Lothlorien, the Noldor (Lindon and Imladris), Woodland Realm, Harad, Rhun, Khand, Umbar, Dale, Erebor, Dwarves of Ered Luin, Dunland, Beornings, Isengard and the Lost Realm of Arnor (Dunedain, they have no leader at the start). I don't know if we will have our own natural wonders unless someone is willing to model them but for now we have renamed/new yields for wonders. For Gorgoroth, Mordor gains special yields from Mordor terrain only available there (which is tundra renamed and reyielded), we might be able to create custom texture for that in the future. And feel free to ask as many questions as you want!