Interesting. It seems a good part of the staff that worked on Rozen Maiden will reunite for this, including the director, Kou Matsuo, currently busy working on Kure-nai. Animation's also by NOMAD.
I suppose that's enough to keep me somewhat interested. It also helps that I loved the author's character designs for Kamisama Kazoku - simple yet appealing. The style shows on the official artwork available for the manga. The covers leaning towards fanservice had me worried (I may be totally off since I haven't read anything yet), but... I can't really see the adaptation going down that path with Kou Matsuo and the rest of the staff anyway.
(And to think that a fake report on 2ch first announced Studio Flag and the person who directed Himawari for this... phew? 
)