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 beling 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.
From http://www.hans-im-glueck.de/dominion/promotion-karten/carcassonne/ 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.