Released in June 2011 in the United States at the Origins Game Fair.
From http://riograndegames.com/news.html?id=30 :
We have just finished printing a new promo card that is a celebration of the 10 year anniversary of Carcassonne being selected as Spiel des Jahres. We will be offering it at our sales booths at Origins and Gencon and it will later be available through retail stores and BGG. It will also be available soon from our other-language partners.
This new Action card has the text:
| Walled Village (Action - Cost 4)
|At the start of Clean-up, if you have this and
no more than one other Action card in play,
you may put this on top of your deck.
The German Promo Card is named "Carcassonne" and will be given away with a Carcassonne Mini-Expansion "Die Schule"/"The School" for a fee of 3 Euros at SPIEL'11 in Essen. The collected fees will be donated to the 'Rainbow over Ghana' fundation and will be used to realize a school-project at Lake Bosumtwi, Ghana.
The German Promo "Carcassonne" will also be released in a German Dominion Big Box will be sold by Metro Group (Galeria Kaufhof; Metro; Real; ...) in Fall 2011.
Part of the Dominion series.