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Graphics
The first big noticeable change with this game is that the graphics have been redone to use a hexagonal (six-sided) grid instead of the old squares. I can’t do enough to express my gratitude for this one, because the old way was so far outdated. If you check out some of the screenshots included in this article, you’ll see that the ground textures are much more detailed and realistic than before, plus the individual military units look better than ever. Combat will be even more explosive based on what kind of weaponry is being deployed.
Diplomacy
One of the changes in Civilization V is that there is supposed to be new and more involved diplomacy between different leaders. Through diplomatic relations, you can exchange goods, learn new technologies, and so on. With this new version of the game, there are City-States which work independently and are major players when it comes to diplomatic relations. You will also be able to work together with other Civs to research new technology.
Another interesting aspect of diplomacy is that the leaders of other civilizations will have much more complex A.I. driving their interests. In the regard, students of history might actually be at an advantage when dealing with certain rulers. According to what I’ve read about the game, the leaders in Civ 5 will now work more toward accomplishing personal goals rather than just trying to beat everyone, so the results should be interesting to watch.