the real question is: how many civs do we want in the game? I noticed that 12 was the original goal but thats seems a bit high. Eight seems more doable also its the number of civs in a normal game. It seems to me that we have seven definite civs: Misthalin, Asgarnia, Kandarin, Fremennik, Tirannwn, Morytania, and Kharidian. And then we have two almost civs: Karamja and Feldip. So the real question is which one of the two do we want? I would prefer Feldip but honestly I'd this should be put to a vote.
Personal notes on the city states:
This is probably a better list than mine.
Tree Gnome Village/Grand Tree: fine fine I'll stop showing off
Zanaris/Keldagrim: both of these aren't on the surface of the game world, they will work if needed but if we can avoid them it might be for the best. We'll need 16 city states if we're going to do a standard size map so lets see if or were we need to cut first.
Arposandra: Honestly I'd rather this not be in game as it is kinda suppose to be a "secret" city. I probably shouldn't have even put it on Tirannwn city list.
Daemonheim: probably would make a much better natural wonder honestly.
Lizards: what even is this? like the hunter creatures?
The Ritual Stone: also probably a better natural wonder.
Honestly I've been thinking on the list of cities that I put down and it might be better if we use the guilds as wonders rather than towns, but if we get enough sure we could use them.
I'm currently working on a secret project of my own which adds 12 more civs and YES it is quite a lot to come up with unique characteristics for all of them. It was even harder to come up with unique effects of 42 wonders, so I'll counsel CivRune not to add too many, at least to begin with.
Of Karamja and Feldip I prefer Karamja, actually, by quite a lot. Feldip is even less inhabited than Karamja if that's even possible, and barely has a society to begin with. (Or maybe I just don't realize it) Plus, jungle tribes with poisonous spears and gem mines... vs. lumbering, uneducated, smash-everything brutes that hunt birds for fun? It's no contest in my book.
The way Firaxis so intelligently hardcoded the DLL or game engine - I don't remember which one is relevant here, maybe both - we can't add new Natural wonders. :/
As I told Warden already, here in the Civ5 C&C forums we will train you to hate Firaxis and make it the object of your frustrations.
Lizards.

I was just looking over the world map and saw "lizards", shrugged and thought "Why not?", then proceeded to put it on the list. Technically since it's on the map it's a location, but admittedly it was mostly for comic relief.
(Vultures was another option, but Lizards is funnier than Vultures)
If it's any consolation, I got what Ta Quir Priw was.

I'm just not sure how many other people do.
Keldagrim is at least in the same dimension as the rest of Gielinor, so I'm pushing for that. Zanaris... eh. I needed more CSs.
Which brings me to my next point: I believe still have some holes in the Mercantile and Maritime CS slots.