There are other anime series that use the semi colon, these for example, Stein's;Gate, Robotics;Notes, and Chaos;Head. They did well out of this kind of name, and this one will be no exception. Occultic;Nine is Chiyomaru Shikura's latest manga novel, but not in the standard sense - this one is a print novel rather than a manga.
Mangas turned into print novels have done really well over the past few years, and not surprising as several yaoi titles have enjoyed this revival into the printed word over a mixture of print and image panels.
Though for those who were hoping to see characters from the other three novels, like CLAMP's Tsubasa: Reservoir Chronicles and xxxHOLIC. That won't happen any time soon, but maybe one day, the book will be released as an anime series.