A new rank card was introduced to the Extended Deck. This optional Courts rank is positioned between the Pawns and the Crowns and is composed of four cards with three suits each (just like the Pawns). The combinations of suits on these cards are the ones that don't appear on the regular deck.
These cards have not been released freely, so they're not really available at the moment unless you buy a decktet from P.D. Magnus (the designer).
More information from from P.D. Magnus can be found here: http://www.boardgamegeek.com/thread/390220