The Promo Pack contains 7 cards, none of which is contained in the base game or any expansion:
4 project cards:
Small Asteroid
Self-Replicating Robots
Snow Algae
Penguins
It also contains 3 corporation cards, created by BoardGameGeek users and published for the BoardGameGeekStore:
Arcadian Communities
Splice
Recyclon
There has previously been 3 more promo cards, but as they are now included in the Colonies expansion, they are no longer part of the promo pack.
