Re: DC's New 52: Reviews and Discussion (Spoilers welcolme and likely)
That's something new for Morrison. Usually he makes references to ultra obscure things that happened in a single issue several decades ago, and makes them key plot points like you're supposed to remember them.
"In Brightest Day, in Blackest Night, no evil shall escape my sight. Let those who worship evil's might, beware my power: Green Lantern's light!"