Why? Look what's on the front: a modern, amateurishly Photoshopped mockery of the original trilogy posters, even tying in inappropriate elements of the prequels (Hayden Christensen's ROTS Vader).
That represents the 2004 SE in a nutshell.
Then, relegated to the back of the case (to denote their lack of importance), you have the original posters in all their glory.
That represents the treatment of the original unaltered trilogy in this set.
I couldn't imagine a more appropriate cover for the 2006 releases myself.
--SKot
P.S. - mustn't forget to include mandatory teenage basher keywords: "Lucass", "Luca$h", "gay"