The newest video in the series of previews for Civilization V's Brave New World expansion features the topic of Policies and Ideologies. Namely, how the new and overhauled system of assigning policies and deciding how you'll rule has been expanded and deepened for this expansion.
In Civ V, the Ideology system is overhauled and new items have been added to accommodate the new Culture victory, as well as a new Exploration tree that focuses on maritime exploration. Now, as the video shows, you'll be able to adopt a new ideology, choosing from Autocracy, Freedom, and Order. Early adopters will get two free policies in their category of choice.But the big impact of the new system might be that whichever choice you make will have effects until the end of the game on your abilities as well as diplomacy. There's also the nifty bonus of a unique Wonder per ideology, as well as a scaled tenet system that you'll be able to level with earned Culture.