i bought it today. It's really good. I've never read it before, becuase the original is out of print, and im too lazy to hunt for it. But yea, like Fledermaus said, it's just a reprint of the original graphic novel version in an 80 page comic form(like countdown to Infinite Crisis).
Cool story, nice ending, and i hope Morrison's run makes the concept far better than it already is.