The Brazlian unique unit could be the beggar orphan... yikes.
The new world is too new to have much inclusion - the United States makes it simply because of it's overwhelming modern dominance.
The only one I voted for that doesn't appear to be getting traction is the Zulu, and that's honestly just Civ nostalgia behind my wanting them...
The one that I always underestimate are the Dutch. I guess it's their relatively small role in the modern world. Hey, I gotta hat tip Denmark though for stepping up in Iraq, bonus points for them there... in fact, that's convinced me, gimme the King of Denmark...
Babylonians seem a shoo-in, and should be. Same for the Ottomans and Vikings. I wouldn't mind seeing a Native American tribe entered (though hard to argue for a culture that couldn't invent the bloody wheel). Gotta thumbs down the Portuguese, they seem like Spain-lite (though more Iraq props).
Venger