Quote: "Darkest Night - Is this referring to the Batman graphic novel?"
It's a Green Lantern graphic novel, named from the fact that, and I quote the sacred Green Lantern code, all Green Lanterns would fight through "Through Brightest Day and through Blackest Night...", and the "Blackest Night" had supposedly come. There is a similar graphic novel from Batman though, called "In Darkest
Knight," once again a take from the Green Lantern code, for Bruce Wayne had supposedly taken Hal Jordan's place as the leader of the Green Lanterns, so they modified the common phrase, and made "Blackest Night," "Darkest Knight," for that was more of a Batman appropriate name. Gosh, get your facts straight.
And no, it is probably not.

Batman! DANANANANANANANANANANANA BATMAN!