No one posted links to the pair of civ5 live gameplay videos? Gosh.

Part 1
Part 2

After watching them I think I might skip the demo and preorder for release. Lots of good stuff in there, though I'm still not convinced about the new warfare model. That needs to be experienced. The focus on fewer cities is a good move IMO; I liked civ4 when 5 cities was about right for most of the game span. In expansions it became easier and thus more important to have more and more cities.