I haven't given up on DoS, but it does seem pretty improbable. I like to hope that the reason for the delay is that he wants to have all his ducks in a row in that one so he doesn't tie himself in knots doing DoS; or (related to that) maybe that he's realized but refused to accept that there's too much material for two books and can;t get all the ducks in a row in one book because of that.