EighthSquall sent XSEED an email about a limited edition of Pandora's Tower. While that's not happening, XSEED did hit at some other artwork-related possibilities.
Afraid there is not going to be a Limited Edition version, just the standalone game. However, we will look into a reversible cover or perhaps adding some artwork into the owner's manual.
Not a total wash, which is a good thing. I'm always a sucker for reversible covers!