From what info was posted on Apolyton about it, Civ5 seems to be much more like Civ3 than Civ4, which is awesome.
- Switch from squares to hexagons changing the way the game plays. More room for maneuvers and more tactical options.
- Changes to combat. More depth in combat, no more stacking of units. This will lead to bigger focus on terrain.
- Inspired by Panzer General.
- Reintroduction of Bombardment, now archers and siege equipment can shoot over melee units.
- Better diplomatic AI.
- More diplomatic options between players.
- Less "cheating" AI.
- Religion is not a factor anymore.
- Ressources are not infinite. For example one source of horse only supplies enough horses for 1 unit, but when that horseman dies the horses will respawn as a unit. (this confused me alittle, i guess we will have to watch it in action)
- City States as a sort of small countries that never develop beyond their single city. They can provide bonusses if you befriend them, or you can take over their land.
- Civics are out, now there is something called "Social Policies".
- About the same amount of wonders, the tech tree will feel familiar. Great People still in.
- Some victory conditions changed. For example in Conquest you only have to capture all the other capitals. Eliminates boring mop up phase.
- Unique Civ leader bonusses, no more standard "Spiritual" or "Financial".
- DirectX 11 support.
- Built in webbrowser. Sid Meier is also working on a facebook application of Civilization.
Problem is I will most likely need to get a new computer, and I start college this Fall.
is probably going to be the foremost source of info because Sid Meier has been known to post there occasionally.