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Why would accessories be released before the port exists on peoples computers?
Thunderbolt, previously light peak is brand new tech, nobody but intel and apple were working on it so of course apple is going to be the first to add the port to the computer and accessories will follow.
How could drive makers implement thunderbolt when they didn't even know what kind of connector it would use? People weren't even really expecting light peak to start hitting devices until late this year or early next year.
Because when Apple releases the latest iPhone, iPad, iWhatever, you go and pick up the cases, sleeves, covers, etc. that fit the newest design.
People have begun to expect accessories to be available at launch.