The Romans and Greeks will both undoubtedly be included, pretty much covering a Greek speaking Eastern Roman Empire.i am sort of distressed not one person suggested Byzantium. and lasted longer than any state ( except for kush) and it had a huge influence on other civilizations,
Turkey would be used to represent the Turkish state whether it was called "Turkey" or not. Much like how Greece represents the various Greek states (notably Athens and Macedon), not the country of "Greece". And Germany should represent the various German states (at least from the HRE) which was a major objection to the HRE in BTS.'d say substitude Turkey with Ottoman ... the Ottoman empire had much more impact than Turkey have had ...
I do hope for multiple leaders for all civs, it just adds so much. And the ability to mix and match (unlocked leaders in BTS). Perhaps even further differentiate leaders beyond traits, with a special leader unit (say in addition to the American UU, Navy Seals in Civ IV: FDR would have a B-17, Washington a Minuteman, Lincoln a Monitor).