We are living in the regionalization age of AoE2, which means new regions will be maded in order to add more civilizations that can share architecture, buildings and units in common.
But from the already existing ones, there’s few to add in the next DLCs:
North America: Iroquis and Sioux
Central America: Split Aztecs from Maya and add new related civs like Kiches and Chontales.
New african region: Separate East (Ethiopians) from West (Malians) to include new civs. Maybe central or southern Africa as well.
Balkans: Vlach and Serbs
Himalayas: Nepalis and Tibetans
Scandinavia: Sewds, Finns and Vikings
Oceania: Polynessians and related civs
Tropical American: Taino and Carib (maybe a future Tupi relocation).
Japan: only if a Japanese split is maded, I believe East Asia deserves it’s own architecture, because the current civ is more japanese than chinese.
Steppe Nomand: not a geographic region though, but there’s already a regionalization from the nomad civs like Mongol, Huns, Khitans, Jurchen and Tatars, all under the Steppe Lancer unit.
Acient China: only if the 3K civs are moved from AoE2 to Chronicles client.
I was thinking in Minor Asia / Anatolia, but I don’t know which new civs can be added to share with Turks.
