Song also revealed four of the game's classes, confirming Engineers, Miners, Soldiers, and Farmers for release. Players will be allowed to change careers if desired, though career-swaps carry risks. Progression requires that players develop skills in order level their characters up. Technology advances will be made based on how players focus their resources.
Civilization Online will be different from previous Civ games thanks to its MMO nature. However, Song confirmed that the game will have several win conditions that end the session, such as a player conquering all other civilizations or launching a spaceship. When a player wins, the game starts over with everyone back at square one.
[Thanks to Dengar for the tip!]