On Aug. 1st, Shinchōsha announced they would publish a “Juuni Kokuki” calendar 2014. It has Yamada Akihiro illustrations for the entire “Juuni Kokuki” edition. But, I didn’t know they were going to accept orders from out of Japan. Today, I found a page on Japanese Amazon. It seems you, who don’t live in Japan, can get the calender.
If you care a great deal about it, please jump to the page “Juuni Kokuki” calendar 2014
For you it might not be reasonable about its price. It is ￥1890 in Japan.