Re: DC's New 52: Reviews and Discussion (Spoilers welcolme and likely)
Legion of Superheroes, Dial H, Demon Knights, and Threshold are all cancelled. Not all that unsurprising. I've not picked up any of them, though I heard good things about Demon Knights.
"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!"