I already made a post below about the new game, Civilization V, but I think this deserves a post of its own.
After starting to play this game 2 things really intrigued me.
1. They've removed the individual religions that were a crucial part of Civ IV.
2. They've replaced Civics with Social Policies. There are 10 of them, and the 2 that I really like are Piety and Rationalism.
Piety represents your civlization's devotion to religion and Rationalism represents your civlization's devotion to science. These 2 Social Policies cannot be used at the same time. So the creators of Civilization V are basically saying that your civilization is either religious or rational. Haha, Fantastic!