I'm becoming a devotee of Jeff Lemire's writing. This one-shot reads like a teleplay. I wouldn't be the first to speculate that for Warner Bros., DC functions as a sort of R&D lab. If so, this comic book is a great pilot. By the time you're done, you want this to be a TV show.
In a recent interview at Comic Book Resources, Jeff Lemire gave up some surprising tidbits concerning the nature of the DCnU, saying:
"As far as I know, and I might be corrected on this, the "National Comics" titles are out of continuity because I know that there is a Madame Xanadu one and it has nothing to do with the New 52 Madame Xanadu. So no, I don't make any reference to any other DC Universe character. It is a self-contained, totally out-of-continuity take on the character. We just kept the original name and stuff."Also, he'd originally wanted to include Eternity in his Justice League Dark title.