Here is the source:
http://www.wiwo.de/pswiwo/fn/ww2/sfn...t/0/index.html
Summary: Owners of the premium-card can use special checkin-areas (hopefully not the LH-F-Class-Area at Terminal 2!) and fast lanes at security (hopefully not at the LH-F-Class-Area at Terminal 2!). The price for the premium card will be a "low triple-digit Euro-amount" yearly.