A new civ always comes in a DLC together with another civ and 3 campaigns, therefore some possible DLCs:
India: [DLC concept] The Wealth of India (Bengalis & Tamils)
- Bengalis
- Tamils
- Persian campaign (or Chinese)
East Asia:
- Siamese
- Tibetians
- Chinese campaign (see Wealth of India) (or Korean)
Sub-saharan Africa:
- e.g. Somalis, Kanembu, Benin, Yoruba
- Turks campaign? (or third new civ with campaign)
(perhaps) Caucasus (non-European civs should have priority):
- 2 of 3: Georgians, Armenians, Khazars
- Slav campaign (e.g. Kievan or Muscovite Rus’)
(perhaps) Americas:
- Chimú New civ concept: The Chimu
- Tarascans New civ idea-Tarascans or Mixtecs (incl. Zapotecs)
- Maya campaign
(perhaps) South India:
- Kannadigas
- Telugus
- Chinese campaign (see Wealth of India)