From the DC blog:
This October, “Lights Out” will span across all of the GREEN LANTERN family titles. And earlier this week, Relic’s Villains Month one-shot hit stores and set the stage for this epic crossover event that will change the Green Lantern universe forever.
“There are seven different colors of the emotional spectrum, each of them represented by their own corps. Green Lanterns wear rings powered by will, Red Lanterns rage, Yellow Lanterns fear, and so on,” GREEN LANTERN writer Robert Venditti explained to COMIC VINE. “For reasons none of the Lanterns are sure of, the rings have been malfunctioning lately. Enter Relic, a remnant of the universe before ours, who thinks he knows what's wrong with the rings and has a solution. Unfortunately, ridding the universe of every last Lantern is part of that solution.”
“The way I describe the story is, it'll tie together every Lantern of every Corps who has ever appeared in any comic book – ever,” Venditti also told COMIC BOOK RESOURCES about the crossover. “It's an ambitious story, and our editors have been great about letting us take substantial risks with these characters. We're holding nothing back.”