According to Comic REX official website, a spin-off manga of Kannagi
titled "Kanpachi" was announced to be serialized from the April issue. The author is Yuhki Shinichi
, the elder brother of Takenashi Eri
The serialization of Kannagi in Comic REX magazine has been suspended since December 2008 due to the sick leave of Takenashi.
Sources: Comic REX official website
, Yuhki's official website