Well, so some lazy Sunday afternoon musing on Grant Morrison's Batman led me to this. Hmm. Time to reread Seven Soldiers: Mister Miracle then, I think.
I'm not quite sure I've figured it out yet, but I hope the story doesn't hinge too much on some obscure bit of DC Universe continuity when it's done.
Now, Final Crisis, on the other hand, I don't have much hope for at all.