Kawade Shobo Publisher created an official site for the upcoming CLAMP Mokona no Okimono Kimono book.
It contains samples of the book (some of which we already seen, while others not), a (what seems to be) message handwritten by Mokona herself, and a wallpaper download featuring the book cover.
The site also reveals that the book will have a short comic drawn by Tsubaki Nekoi and an essay written by Satsuki Igarashi.
As you might well know by now, the book will be released on the next 14th.
Thanks to for this bit of news!