I really should have posted this last week when it was still fresh, but here you can find the Yosumin Developrs Blog updated by Director Iwasaki-san (I keep saying it, he IS Yosumin, such a nice chirpy guy). Wherein you can see concept art and the like. Akin to this;
Check back from time to time as I think they will be releasing a heap of ideas we had. All of which was a heap of fun to be involved in.