Grant Morrison's extravagant universe-building bout of madness, I'm sure, will appeal to many a gamer weaned on D&D's Great Wheel. It certainly did to me.
Here's a YouTube video (http://www.youtube.com/watch?v=Opoc-AjMlww) more or less explaining it all.
And of course is right up front on DC's website (http://www.dccomics.com/).