DC Comics has announced Forever Evil: Blight, a tie-in to Forever Evil, launching in October (see "First 'New 52' Universe-Wide Crossover").
 
Beginning in Justice League Dark #24, which ships in October, and ending in Justice League Dark #29, which ships in March of 2014, Forever Evil: Blight is an 18-part epic saga that also runs through the pages of Constantine (#9-#12), Trinity of Sin: Pandora (#6-#9), and Trinity of Sin: The Phantom Stranger (#14-#17).
 
Protected by the House of Mystery, John Constantine appears to be the only survivor of the invasion of Earth by the Crime Syndicate, but he refuses to believe that Zatanna and the rest of his teammates are dead.  Unfortunately, the invasion has "enhanced the levels of evil in the universe," creating a physical force of evil who goes by the name of Blight.  Partnering with Swamp Thing, Nightmare Nurse, Pandora, Phantom Stranger, and The Question, Constantine must battle Blight to save the girl and, possibly, the world.
 
 --Brett Weiss