Amazon.jp has the cover (or promo image) to the 2011 xxxHolic calendar up. It sorta looks like the back since it doesn't have '2011' or title on it. It also looks like it may consist of colored manga pages. It will be on sale October 13th.
Amazon.jp also has the cover to the 2011 Kobato. calendar up. It looks like it will be an anime calendar this year. It will be on sale October 20th.