I'm probably going to think of Aldous Huxley whenever I hear of this expansion for like 6 months. Even if I haven't read that book since a couple years before I joined CFC.
But I like the name better than "One World". "Brave New World" applies well to progressing technology, and not just futuristic dystopias. It was a brave new world when the New World was being settled, when revolutions were forming across Europe in 1848, when the Great War and all its devastation occured, when Communism took hold in Russia. In a way, it indicates a more modern focus, similar to how "Beyond the Sword" did, but less militaristically. It also fits in rather nicely with both the literarcy references, and the struggle between freedom, autocracy, and order that is said to be emphasized. And it still works with globalization and trade - that in itself is a brave new world compared to the more isolated economies of the past century. But these "brave new worlds" don't have to be dystopian, as Huxley portrays it.
Whereas "One World"... IMO the associations are worse. It says there is only one world, which will make Call to Power fans yearn for its multiple maps - not a good thing to be reminded is lacking. It can portray unity, but more so portrays one world government, which I think most associate more with dystopia than utopia. I reckon it's actually more dystopian than Brave New World. I tend to associate one world with the
Majestic 12,
Illuminati conspiracies, the
New World Order, and so forth. And while your goal in Civ may well be to conquer the world and be the sole ruler, I don't think the "One World" title would be portraying that in a very positive light.