Merciorum
Prince
I get the feeling a lot of people are going to be very surprised by last civ (after the european one) that is added...
Actually, I'm beginning to feel as though you're right. I'm expecting Venice, but the last one could be anything. The Sioux are still my favourites, but I think it's very possible that they'll suddenly come in with the Tuaregs or the Navajo or something, and that the alphabet theory will be a load of rubbish...
(Or maybe the Oman. I'd still really really like Oman or maybe even the Cherokee, which would make my day).