That seems to be the rumor flying around the NYCC convention circuit. It appears that Simone who co – writes The Fury Of Firestorm with Ethan Van Sciver is leaving the title allegedly over editorial differences with DC. However she will remain on writing duties for Batgirl.
At this moment this is just rumor and nothing has been confirmed. Though DC Comics has promised big announcements concerning the future of New 52 which will presumably include different creative teams working on their various titles during their NYCC panels this weekend. I’m sure this rumor will be a topic of discussion. I’ll keep you posted.
Source: Bleeding Cool