Well, it`s easier to say which are not in my to-do list.
My Chinese pack could be used as the model for further packs.
Just imagine about 20 major civs with the next historic sub-periods:
Bronze Age
Early Iron Age
Later Iron Age
Dark Ages
High Medieval
Later Medieval
Actually, it covers almost every significant Ancient and Medieval civ or region.
For example, Visigoths could be used as Dark Age`s units for Spain; Huns as early units for Mongols; Sumers and Assyrians as early units for the later coming Mesopotamian empires etc.
Also, I plan to make Ancient and Medieval Settlers/Workers for the civs which don`t have them yet.