Dynasties! Added to that, governor units that can rebel ("Fear will keep the local [colonies] in line.") More politics/diplomacy. Better trade system. More streamlined / ingame customizable civs. Start with a ton of civs, and bloodbath it to the finish line. More organic growth of technologies/philosophies and religions. They've gone pretty wide, I'd like now to see them go deep with the design. [Edit] And don't tell me I can't raze a capitol to the ground! I'll salt your fields for that!