Very bad news indeed... the
original blog post specifically says:
- It is very difficult to make a 2012 release for Kizu- (not impossible)
- They haven't decided yet on the format of Neko/Kuro
- They are considering Neko/Shiro to be 2-seasons
Mind you the original source (not the blog post or ANN's interpretation) I can not read, scan is low res.
EDIT: On the other hand they have green-lit all the novels, so it is very likely that the series will be complete in one or two decades