Of the top of my head, in no particular order: Polynesians, Cahokia, Tibet, Ireland (modern), Argentina, Sioux, Afghanistan, and if we're being really selfish for a moment, Belgium. It'd be nice to not always be a city state/independent people :P

I would like to see cultures implemented that are not traditionally considered empires but were instead notable cultures. Think Caribbean pirates, Papal Catholics and Mafias. I'm probably asking for too much but I feel like the game in its expected release state is unable to distinctively tell the difference between land, empire and culture that changes the game from leading another civilisation, which switches its cultural identity, to leading a people with a legacy

Polynesians would be cool

I have to admit... I might be biased, since my origins are from Albania, but I would like to see represented the league of Lezhe at the time of Skanderbeg, maybe represented as a militaristic culture, a man can dream...

But as I stated in another comment previously it would be nice to see more balkan cultures in general.

• The Scythians, because I love playing as the Huns and the Mongols.
• The Kushan empire. A Indio-Hellenistic empire that ruled the connection between the Parthians, Han, and pre-Gupta empires from 30ce to 375ce. I can see them as a classical era economic empire that benefits from having other cultures and boarders be near you. Taking a negative and making it a bonus.
• While the Umayyads are the G.O.A.T. of empires for the western medieval period, I'd love to see some diversity with their successors, Abbasid and Cordoba/Andalusian. 
• The Early modern era would be richer with the inclusion of the Uzbeks, after the Timurids, their Khanates ruled Central Asia for most of the 16th and 18th century. Like wise, another option is the Kazakhs, who split from the Mongols and ruled independently till the 1822. 

That's just echoing other posts, but more early Slavs.

Other than that, I hope that if/when more cultures are added some mechanics to prevent overabundance of cultures is added, i.e. while there'd be more cultures available in the game, amount of cultures available per playthrough wouldn't change. I really hope player will stay in a race for cultures, instead of being limited to what flavour of, for example, Agrarians they'll choose for their next step.

I would want one nordic culture per era...
What, No I am totally not Biased :D

Tnecniw wrote:

I would want one nordic culture per era...
What, No I am totally not Biased :D

Suomi! Suomi! Ahahahah I currently live in Finland and I must admit it would be cool to see Finland represented, maybe as an industrial civ. Many brands known worldwide like Fiskars, Kone and many more come from Finland.

Denmark and Norway could definitely have their spot too! If Iceland and their sagas would make it to the game, I wouldn't be sad.

Etruscans

Basques

Well, from a mechanical perspective, I would love to have a few more cultures that are really Faith and religion focused. I know it is not a traditional FIMSI output, but from my experience in the OpenDevs it is an unexplored design space.

Something like a few more Arabian states for a more traditional “Historical 4X feel” could work. I am not an expert on the subject, but I also know that quite a few states and cultures in southern Asia had strong spiritual roots.

Another neat option could be some of the crusader states, although that is somewhat covered by the Teutons already. The Kingdom of Jerusalem could be a strong shoe-in for something like this.

MaiFlow wrote:

Well, from a mechanical perspective, I would love to have a few more cultures that are really Faith and religion focused. I know it is not a traditional FIMSI output, but from my experience in the OpenDevs it is an unexplored design space.

Something like a few more Arabian states for a more traditional “Historical 4X feel” could work. I am not an expert on the subject, but I also know that quite a few states and cultures in southern Asia had strong spiritual roots.

Another neat option could be some of the crusader states, although that is somewhat covered by the Teutons already. The Kingdom of Jerusalem could be a strong shoe-in for something like this.

I think that would be a fitting expansion honestly. An expansion focusing on expanding out the religion system, add a few religious cultures and so on.
I REALLY hope they do. It needs some flavor.

I just realized, there is no classical Chinese civ. Maybe the Tang? It is traditionally considered the greatest age for Chinese poetry. Li Bai and Du Fu, two of China's most famous poets belonged to this age, as did many famous painters such as Han Gan, Zhang Xuan, and Zhou Fang. Tang scholars compiled a rich variety of historical literature, as well as encyclopedias and geographical works.

I would really like to see an improvement in variety regarding modern population first, as to get as much people as possible identified, that said I'd like to see:

Argentina, South Africa, Vietnam, Nigeria, Cuba, Colombia, Canada, and many more.

I think it could also be nice to replace current germany with Prussia and add Germany as a contemporary Culture

I want to more relationship between the era. Examples, concept for east asia, I started zhou first, but the game don't have a culture at classical era. And it is crowded at early modern and contemporary. 

The cultures are largely similar from region to region.  So, I hope that the next dlc will fill in the culture of the empty era by region. the region, for example, west, east, south europe and west, central, south, east, southeast asia... etc. Of course, like Rome, a country can be in several regions.