Four new Civilization V previews have been posted on the internet: Kotaku, Joystiq, Gamespot and 1UP


Each article goes into different levels of detail, and there is a lot of double up with already known information. However some tiny new bits of information have been gleaned from the articles:

• Aimed minimum specs to include 256 MB graphics cards and dual core processors (Kotaku).
• Cities can fire back when attacked (Kotaku).
• Technology and Culture victories contain new surprises (Kotaku).
• Producer noted that all Civ games eventually come out on Mac (Kotaku).
• Confirmed DX11 native (Joystiq).
• Different terrain for different continents (Joystiq).
• Leaders respond with spoken speech and body language (Joystiq).
• City-states can give you units if friendly (Joystiq).
• In-game web browser, play Civ Network from within Civ 5 (Joystiq).
• Full support for modders, including online database of mods, voting and forum access (Joystiq).
• Russell Vaccaro designing Civ 5 interface (also helped design Civ Rev interface) (Gamespot).
• Ruins instead of goodie huts (Gamespot).
• Greece confirmed (Gamespot).
• A troop operates like a single unit from previous Civs, example being "troop of warriors which act as a single warrior unit" (Gamespot).
• City-states will have different specialisations, such as Militaristic (Gamespot).
• City-states offer missions (Gamespot).
• Referred to "a single battalion of troops that occupies any given hex" (Gamespot).
• Units will suffer maintenance costs and be able to earn bonuses through combat (Gamespot).
• Rivers give defense bonus (Gamespot).
• Cities defend at a level determined by growth size and structures in the city (Gamespot).
• Religion may be cut, but new features to replace it (Gamespot).
• Alexander the Great (1UP).
• City-states will have their own Tech tree and personality (1UP).

There are also a couple new screenshots, visit the Civ 5 forum for details.