Japan: officially announced by Kodansha on June 8, the title is 異域之鬼, "iiki no ki"
which I'd dare romanizing as "iiki no oni" - the demon of foreign lands - please correct me if I'm wrong. The universe of this series will contain black magic and the story is even going to be truly epic according to the publisher! I've updated my page about the series with some cool info, please click here (French only).
EDIT June 11: it's "iiki no ki" and not "iiki no oni" - Thanks to Yuki sensei for clearing this up in her blog! :3