What should be theme of the next expansion we're getting (if we're lucky enough to get one)?

Age of Empires II: DE II - Discussion
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  1. DLC (Western European)Lords of the West + 2 civs: Burgundians, Sicilians
  2. DLC (African) + 2 civs: Swahilis, Kongolese
  3. DLC (American) + 4 civs: Mississippians, Haudenosaunee,Tupi, Caribs
  4. DLC (Eastern European) Boyars of the East + 4 civs: Wends, Serbocroats, Georgians, Armenians
  5. DLC (Asian) + 3 civs: Thais, Tibetans, Bengals