TI3 contains new oversize board tiles, more than 400 cards, every known civilization of the Twilight Imperium universe, almost every expansion rule and component ever published for Twilight Imperium, a gorgeous graphical overhaul, and an impressive full-color rules set.

The Twilight Imperium gameplay has been refined and redone by original designer Christian T. Petersen. The new design features faster gameplay, and involves players in a far more active game experience, with much less downtime. In addition, TI3 will include the new "Race Cards," as well a dramatic new approach to the structure of the gameplay itself using the new "Command" system.