It is special because it comes with a black pauldron design. That right pauldron in black is more like a Sergeant rank while the regular white is Corporal.
The Sandtrooper Special Version comes with two gun powder type rifles and a katana sword .
Or squatting down
The set includes 6 interchangeable hands, 1 slim and 1 bulkier blaster rifles, Katana sword and a backpack, and interchangeable white pauldron or black.
It will be on sale at the event for US $89.99.