I would like that the expansions of Civ V were about periods or areas, like CivV: Ancient Times or CivV:Far East. They could include many civilizations and many scenarios. The programmers can do many expansions of Civ V and no more parts of the Civ saga, that is, I dont want CivVI and CivVII. Besides, I would like less European civilizations and more civilizations of all the world, mainly Africans, that were important in History although we dont know.
Anyway, my next 18 civilizations and each 3 leaders for the expansions are:
19) Mongolia (CivI-IV)
-Genghis Khan (CivI-IV)
-Kublai Khan (CivIV)
-Ögodei Khan. As sucessor of Genghis, he conquered huge territories in China, Central Asia and Eastern Europe.
20) Assyria. It was an Empire of the area of Syria, Irak, Turkey, Lebanon, Palestine and Israel during the 19th-7th centuries, destroyed by Babylonians and Persians.
-Ashurbanipal, also known as Sardanapalus. He developed the Assyrian art and literature and conquered the Empire of Elam.
-Tiglath-Pileser III. He founded the Neo-Assyrian Empire and conquered Hatti territory, Persian territory, Philistia and Israel.
-Sargon II. He conquered Samaria and Babylon and defeated the armies of Urartu, Elam, Egypt and Philistia.
21) Carthage (CivII-IV)
-Hannibal (CivII-IV)
-Hanno the Great. He conquered territories in Africa, was enemy of the Barcid family, which Hannibal was member of, and so belonged to the pro-Roman faction of the Carthaginian Senate.
-Mago I. He was the King of Carthage and, in his time, this phoenician colony became preeminent in Western Mediterranean economically and politically.
22) Sioux (CivII and more or less CivIV)
-Sitting Bull, also known as Tatanka Iyotanke (CivIII-IV)
-Tecumseh. He leaded a tribal confederacy against the US and helped the Bristish in the War of 1812.
-Crazy Horse, also known as Tasunka Witko. He was leader of the tribal alliance with Sitting Bull and Red Cloud and participated in the Battle of Little Bighorn.
23) Khmer Empire (CivIV)
-Suryavarman II (CivIV)
-Jayavarman II. He was the founder of the Khmer Empire.
-Indravarman I. He was a builder ruler: irrigation systems, shrines, moats, etc.
24) Mali (CivIV)
-Kankan Musa I (CivIV)
-Sundiata Keita. He founded the Mali Empire and conquered the Ghanan Empire.
-Uli I, also known as Ouli or Ali. He conquered Gambia and lands of gold minery between Senegal and Mali.
25) Songhai Empire. It was an Empire of the area of Niger, Nigeria, Mali, Burkina Fasso and Senegal during the 7th-16th centuries destroyed by the armies of Morocco Sultanate, which were leaded by a Muslim Spaniard.
-Askia Muhammad I, also known as Muhammad Toure. He set up a developed bureaucracy and made his Empire strong in trade and economy.
-Sunni Ali Ber. He conquered the most of the territory of Mali.
-Askia Daoud. He expanded the Empire and defeated the Mossi in battles.
26) Turkey (CivIII-IV)
-Suleiman the Magnificent (CivIV)
-Osman I (CivIII)
-Mehmed II (CivIV)
27) Hatti (CivIII)
-Suppiluliuma I. He conquered the Mittani Kingdom and conquered Egyptian cities.
-Mursili II (CivIII)
-Hattusili I. He united all the Hittite Kingdoms in an Empire.
28) Maya Kingdoms (CivIII-IV)
-Pacal II, also known as Kinich Janaab Pakal (CivIV)
-Ah Mekat Tutul Xiu. He founded the Mayapan Alliance, which joined the Itza, the Tutul Xiu and the Cocom from 10th century to 12th century.
-Kinich Yak Kuk Mo, also known as Green Quetzal Macaw. He was the first King of Copan and the founder of Yax Kuk Mo dinasty, in which time (5th-9th centuries) knowlodge of maths and astronomy, writing and art was developed.
29) Iroquois Confederacy (CivIII)
-Hiawatha (CivIII)
-The Great Peacemaker, also known as Deganawida. He was a prophet and spiritual leader who founded the Iroquois Confederacy.
-Red Jacket, also known as Sagoyewatha. He negotiated the independence of the Six Nations with G. Washington.
30) Celts (CivII-IV)
-Vercingetorix. Member of the Arverni, he united the Gaul peoples to fight Caesar.
-Viriathus. Member of the Celtici, he leaded the Lusitani and the Celtici to resist against the Romans, who were defeated several times, in Hispania (Spain).
-Boudica (CivII&IV)
31) Vikings (CivII-IV)
-Ragnar Lodbrok (CivII-IV)
-Cnut the Great, also known as Canute, Knut or Cnut Sweynsson (CivII)
-Erik the Red, also known as Eric Thorvaldssen. He colonized Groenland.
32) Majapahit. It was an Empire in Indonesia, Singapore, Malaysia, Brunei, the Philippines, and East Timor during 13th-16th centuries, destroyed by a Indonesian Sultanate.
-Hayam Wuruk, also known as Rajasanagara. His reign was the golden age of Majapahit because conquered territories and the Javanese culture was developed.
-Raden Wijaya, also known as Kertarajasa Jayawardhana. He founded the Majapahit Kingdom.
-Tribhuwana Wijayatunggadewi. She conquered neighbour kingdoms in a great expansion.
33) Korea (CivIII-IV)
-Wang Kon (CivIII-IV)
-Sejong the Great. He created the Korean alphabet and developed the Korean science and culture making inventions and writing books.
-Taejo, also known as Yi Seong-gye or Yi Dan. He was the first Korean King of the Joseon Dinasty (14th-20th centuries) and established the capital in Seoul.
34) Kongo. It was a Kingdom of the area of R.Congo, D.R.Congo, and Angola during the 14th-19th centuries, destroyed by Belgium, Portugal and France.
-Nzinga Mbemba, also known as Mbemba a Nzinga Ndo Funsu or Afonso I. He converted his Kingdom to Christianism and estableshed the Catholic Church of Kongo in order to create a unique society. He expanded the Kingdom with Portuguese mercenaries.
-Nkuwu Nzinga, also known as Nzinga a Nkuwu or Joâo I. He developed his economical relations with the Portuguese and adopted the Christianism.
-Lukeni Iua Nimi, also known as Ntinu Nimi a Lukeni. He founded the Kingdom of Kongo.
35) Zimbabwe, also known as Great Zimbabwe and, later, Mutapa or Munhumutapa. It was in the area of Zimbabwe and Mozambique during 13th-18th centuries, ruled by the Shona and destroyed by the Portuguese. This is the real civilization whose capital was Zimbabwe, not the Zulus, whose capital was Ulundi in South Africa.
-Matope. He extended the Mutapa Kingdom into Empire conquering lands of other peoples and developed the trade of minerals and ivory.
-Mututa. He conquered Great Zimbabwe and founded the Mutapa Kingdom.
-Rusvingo. He founded the Kingdom of Zimbabwe.
36) Ghana, also known as Wagadu. It was an Empire of the area of Mauritania, Mali and Senegal during the 8th-13th centuries, annexed into the Mali Empire.
-Dinga Cisse, also known as Majan Dyabe Cisse. He founded this Empire in a political centralization.
-Bassi. He resisted the Berber attacks of the Almoravids.
-Tunka Manin. He was defeated by the Almoravids.
My next civilization would be the Zulu Kingdom, not Zululand because this was the name of the Zulu territory under British rule. I dont choose the Zulu Kingdom in my 36 civilizations because its duration was so short (1818-1897) and it was so small (30,000 km2 around Ulundi). My 3 leaders would be Shaka, Cethswayo, and Dinizulu.
Particularly with Chinese culture and values, we have a love-hate relationship with that, so... yeah.
After all, both German leaders are of Prussian origin. 
The UU would be the Prussian Needler, a replacement for a Rifleman/Musketman type unit. The flag would be the iron eagle and the territory color would be beautiful 
Apart from the fact that Agamemnon was a character in The Iliad, you could always have Leonidas of Sparta instead.
, much better regardless:
