DC Comics announced that the Green Arrow scribe will board the ongoing title from issue #0, taking over from current writer Judd Winick.
Nocenti told CBR: "I like continuity so I want to keep her the Catwoman that's been established in the 'New 52'. The other things that are going to start creeping in are, yes, going to be darker.
"She's more villain than hero to me because she's selfish. She's motivated by this need to have things, to want, it's a compulsion, she's got to go get it. And if along the way she does something that seems heroic, it's an accident."
DC is yet to confirm whether current Catwoman illustrator Guillem March will continue to work on the title, or hand the torch to another artist.
March's cover for Catwoman #0, which depicts Selina Kyle in an awkward pose where her face, chest and rear are simultaneously visible, drew criticism from fellow artists when it was previewed last month.
Catwoman #0 is released in September.