I've been playing this mod for awhile now, on a large Pangea as America. Won by cultural victory in the Industrial age, but kept playing until I'd conquered the entire world. And I must say, this has definitely been my favourite mod that I've played!
One thing I noticed though was that the UK seemed to have a lack of special wonders/units. They controlled nearly 25% of the world at one point, and it kinda bothered me how they don't have many particularly strong units. Although, I might have just not noticed it if they did, they were a small, backwater country for most of the game.
Oh, I also noticed that the German U-Boat was called U-Boot. I don't speak German, so I'm not sure if that's how it is in German, or if it was just a typo.
Somewhat related, I think I noticed that Scandinavia's WWII era Swedish infantry had a plane as its pedia icon, not sure if the unit is also a plane or if it's just that icon.
And finally, I'm not sure if you had anything planned to be unlocked with the cloning, bio-implants, or alternative energy techs, but it just seems a little empty and could probably use some kind of super-slightly-futuristic units or something. Just a suggestion, of course.
Oh, and if you don't mind sharing, how many new civs do you have planned to add in the update? Just a little curious, I've been trying to find a good world map to play your mod on, but have been facing some issues with the amount of civs available.
Once again, great mod! Absolutely love it!