OK, here's some information I can share. But keep in mind that it's all tentative.
- The timeline is very similar to the Civ4 RFC one (so, shorter Modern age, longer Classical), but with Classical age even longer. This will later result in an extension of the Ancient and Classical tech trees, and shortening of Modern/Future
- For this reason, I think that adding the Ancient Wonders DLC into the main game is really convenient.
- The DLC included so far are Babylon, Mongolia, Spain, Inca, Denmark (as Vikings). No Polynesia. Korea is yet to be decided. When Carthage DLC comes out, it will for sure be included.
- A DLC free version is not planned at the moment, but it could be made once the mod is complete
- Songhai are replaced by Ethiopia. Leader graphics will stay at it is. This change isn't 100% sure yet, but so far it proved to be a good change gameplay-wise
- Seraphim's UHV mod will be included
- City states are used as RFC independents. They are grouped in Minor Civs. There are 20 or more of them. So, when a civ collapses, it will not necessarily break up into barbarian/independent/native, but it may become Byzantine, or Australian, or Brazilian, depending on the falling civ and on the location.
- Stability is not implemented yet. I am thinking of a kind of civic system that includes religion and government, that should affect stability. The panel will contain 6x5 options.
- Civs respawns, secessions, etc. are not yet implemented
- The map is in my opinion the best ever made. Smaller than the largest civ5 size, it offers plenty of room in crowded areas.
- So far, the DLL is not available. This means: no settlers maps (civs settle randomly), no modifiers (ancient civs are super strong, the game is basically unplayable), no dynamic civ names
- City names map are halfway done. Your help is needed.
- Mercenaries, congresses, embassies, plague and world wars are something that I'd like to do, but who knows when...