Wow if this stuff is true then Civ V is going to be a completely different game then any of its predecessors! I'm going to experience complete culture shock when I buy this game.
http://www.civfanatics.com/ Recent Civ5 Previews
Swedish PC Gamer, as reported by Danielos:
http://forums.civfanatics.com/showthread.php?t=355764
About 50 persons are currently working on the game, which has been in development for over two years, but is now reaching the final phases.
City states:
These are small, AI-controlled civilizations. They never grow big and doesn´t desire to win. The player must choose if he is to be friendly, indifferent or hostile towards a city state. The attitude you has towards a particular city state will have a big effect on diplomacy. If for example your units is approaching a city state that have friendly relations with another civilization, he will warn you, and if you ignore them, there will be consequences.
Barbarians:
The barbarians originate from a barbarian city and will get more advanced units later in the game. You need to wipe out all barbarian cities to get rid of the barbarian hordes.
City expansion:
Borders does no longer expand in large areas, but one hex at a time. Remote hexes like marshes, forests and mountains will be harder to acquire.
Economy:
You can invest money in your neighboring hexagons, for example trying to acquire an important resource before your opponent.
Research:
You can also sign a research-deal with another civilization. This way, both civs will cooperate to reach the new technology and both will gain it when the discovery is made. This was included to encourage cooperation between civilizations.
Diplomacy:
The civilizations will have an all-new advanced AI. All opponents will have fixed characteristics. Based on this unique personality, every AI-player will have their own agenda, which the AI will use to plan how to best play to win the game. But there will also be a certain randomness to avoid having the AI be too easy to predict.