Sid Meier's Civilization V is due to receive its final major expansion on July 9. Titled Brave New World, the team at Firaxis have focused on diplomacy and culture with the introduction of the World Congress, international trade routes, and other features. Recently the game's lead designer, Ed Beach, revealed some more details about what we can expect in the expansion.
One of the new Civs is Portugal, which is a master of exploration and trade. It has a unique unit called a Nao that features a unique ability to perform a one-time trade in order to sell luxury goods in a foreign land. The gold payout is based on how far away the trade location is from your own borders, so it'll really pay to send the Nao out as far as you're able. The Portuguese also have a unique structure called a Feitoria, which can be built in any City-State (including hostile ones) to provide you with a copy of every luxury resource in their territory.
If you're wondering about the expansions new trade elements, look no further. The Cargo Ship can be used to create trade routes between coastal cities, be it your own or another Civ's. A domestic trade route can help bring production or food to a distance colony, while international trade routes can bring gold and religious pressure. International routes also bring science to whichever Civ is less advanced.
The amount of gold generated on an international trade route is based on the luxury resources at either end. If the two cities have the same luxuries, then the gold isn't going to be as great as cities with different ones. So if both cities have spice and silver, you'll probably want to find one that has silk, pearls, or any other ones.
Archaeology sites can be turned into a landmark to receive constant benefits, or broken down into a one-time boost. Digs can be set up anywhere your units can access them, but setting one up in a foreign Civ won't win you any favors. There's a new policy tree called Exploration that unlocks secondary archaeological digs for the first Civ to reach the end game.
Finally we come to the World Congress, which is founded and hosted by the first Civ to meet every other one on the map. The number of delegates at the World Congress changes throughout the different eras, with the host Civ gaining an extra one. Allied City-States also grant an additional delegate, so it's useful to be nice to them. The World Congress serves to change the rules of the current game by way of resolutions.
Only two Civs get to propose new resolutions; the host Civ and one decided by currently unknown criteria. Some resolutions include the banning of specific luxury resources (like whales), taxing all standing armies, or creating the World's Fair shared wonder. Every Civ can contribute to the building of the World's Fair, with rewards based on the level of contribution by each Civ.
Resolutions can be repealed, but only by a Civ that can also propose one. There are some special resolutions that can't be proposed but get voted on once specific technological milestones are met. Those can include banning nuclear weapons, changing the World Congress host, and building the International Space Station shared wonder. Once the United Nations is built, the World Congress is renamed the UN and a vote goes up to elect a World Leader. That vote is regularly recurring, and is the basis for a Diplomatic Victory.
There's plenty more to go on, so be sure to check the video below for all the details.