They should make EU: Antiquity, which would focus on the time of Peloponnesian War through up til the time of Crusader Kings.
It should feature playable Greek city-states, the empires of the Near East, Rome, Carthage etc. etc.
+1This, with the rise of Chrisitanity and Islam and the arrival of the Barbarians. Built on a Crusader Kings 2 like system, with the focus on the dynastic Family and their rise and fall.
I can kinda see the next (or the one after) CK2 DLC being republics, which will be developed alongside Rome 2./sign
This makes me wonder how will the character system of CK2 works on a republican environment such as Rome.