Don't you hate it when I have to tack "probably" and "maybe" onto items because they're not officially confirmed?
Anyway, Amazon is listing a new manga from CMX due out this September titled Carved, according to tweets by keen-eyed Tanbishugi. The book's Japanese title is Kuchisake-Onna, also known as "Slit-Mouth Woman," and is based on a popular 1996 horror flick of the same name.
Come to think of it, I wonder why no one has tried to make a connection between the "slit-mouth woman" legend of Japan and Heath Ledger's slit-mouth Joker in Dark Knight? Huh.