From the publisher's website:
Last Night on Earth 'Zombie Pillage' Supplement
The 'Zombie Pillage' Supplement is a Web-exclusive for 'Last Night on Earth' and features a new scenario and ten new game cards. All pieces are printed on the same high-quality card stock as the boardgame. The cards are exclusive to this supplement and will not be available anywhere else. They feature all new artwork.
This is a new expansion to the popular Last Night on Earth game series similar in form and presentation to "The Stock Up" and the "Revenge of the Dead" supplements.