The Babylonians bring with them new ways to build, protect, and conquer, from mobile storehouses called Ox Carts to The Siege Tower (think Trojan horse) to shield bearers. Additionally, the Babylonians can build out of wood instead of stone.
The land of Mesopotamia also opens up the game with the Fertile Crescent booster pack. This area has level-scaling repeatable quests for the level 20 to 40 crowd. Lead designer Brian Frick noted that this type of scaling content is the direction the company is going in the future. He added, "We just want to have more of our content be fun for all levels to play."
Both the new Babylon pro civ and the booster pack will be purchased using Empire Points, the in-game currency; Babylon will cost 900 EP, and the Fertile Crescent will cost 450 EP. You can read more details in the full interview.