Is there any consesnus yet on which new Civs will be added to RFC? I'd just like to present my opinion here:
Carthage: will surely offer an enjoyable game, but Rome will need even more boost if Carthage is added. Also, it will be silly to see Carthage rule Africa til the end of the game, but I guess changing it's name to Algeria later on isn't possible. I support adding it anyway.
Celts: unnecessary. Barbarians, and will only mess things up for Rome and France.
Korea: also unnecessary. The Korean peninsula is way too small for a new Civ, and will confuse things for Japan and China in a really unrealistic way.
Ottomas: definitely needs to be added IMO. At the moment it is always Greece - or rarely Persia - who ends up dominating Turkey til the end of the game. The Ottomans should balance things up. They probably wouldn't usually end up being such a huge nation that they historically were, but if they'll receive lots of troops they'll cause realistic trouble for Persia and Greece, even Egypt and Arabia.
Scandinavia/Vikings: would make the situation in Scandinavia to make at least a little sense. At the moment such nations as Greece, Persia and Rome rush to Scandinavia with Open Borders, or of they won't get Open borders, Germany and England end up fighting for Scandinavia. A Viking state appearing around the same time as England will make things more interesting. And it'll be quite realistic too, they had an important role in Russian and British history. Will also offer an interesting game, perhaps as sort of "the European Mongols", an aggressive nation.
Zululand: unnecessary. Worthless. Won't offer a fun game at all.
I also support adding Babylonia, which I understand is already being done? And while we're at it, I still think the Aztecs and Incas are useless nations and don't offer an interesting game.
Carthage: will surely offer an enjoyable game, but Rome will need even more boost if Carthage is added. Also, it will be silly to see Carthage rule Africa til the end of the game, but I guess changing it's name to Algeria later on isn't possible. I support adding it anyway.

Celts: unnecessary. Barbarians, and will only mess things up for Rome and France.
Korea: also unnecessary. The Korean peninsula is way too small for a new Civ, and will confuse things for Japan and China in a really unrealistic way.
Ottomas: definitely needs to be added IMO. At the moment it is always Greece - or rarely Persia - who ends up dominating Turkey til the end of the game. The Ottomans should balance things up. They probably wouldn't usually end up being such a huge nation that they historically were, but if they'll receive lots of troops they'll cause realistic trouble for Persia and Greece, even Egypt and Arabia.
Scandinavia/Vikings: would make the situation in Scandinavia to make at least a little sense. At the moment such nations as Greece, Persia and Rome rush to Scandinavia with Open Borders, or of they won't get Open borders, Germany and England end up fighting for Scandinavia. A Viking state appearing around the same time as England will make things more interesting. And it'll be quite realistic too, they had an important role in Russian and British history. Will also offer an interesting game, perhaps as sort of "the European Mongols", an aggressive nation.

Zululand: unnecessary. Worthless. Won't offer a fun game at all.
I also support adding Babylonia, which I understand is already being done? And while we're at it, I still think the Aztecs and Incas are useless nations and don't offer an interesting game.
