Russia, China, Egypt and Germany. Russia mostly because I want to see Catherine again, hopefully in her Civ 4/5 look China has such a long history, it would be nice to have a leader that reflected another aspect of their civilization. Egypt because I'd like to see Hatshepsut again. I think she's underrated in terms of how much she did, and I'd like to see her model in 6. Cleopatra is good, but she doesn't really strongly complement the wonder-building nature of Egypt that I like. Germany because I'd like to see another aspect of their culture highlighted. Having someone other than Barbarossa to deal with every once in a while would be nice. Mostly selfish reasons overall Other strong candidates I think would be France and the USA. Just to see how they could implement them differently.