Civilization V: Brave New World will bring about a much needed improvement to the culture and diplomatic victory.  Policy Adoption will play a more important role with conflicting ideologies becoming more important in how you interact with other civilizations.  The emphasis is to improve the late game experience and make the culture and diplomatic victories more viable and more interesting.  A type of archaeology system will be added to the game.  Trade will become more important bringing about a new unit called the caravan.  A world congress will be featured.  Nine new civilizations and 2 new scenarios and new units and buildings.  This new expansions is slated for release this summer.