Can't believe I missed this site.
It's the Clamp 15th Anniversary site and they have pictures of all the chess pieces.
Color pictures of the ones that have been released in Japan, and sketches of the last couple
sets that aren't out yet. This is the first time I've been able to see what the last three sets will look like.
Go to this page:
http://www.clamp15th.com/book/index.htmlClick on the wing above the number of the issue you want to see.
If you also want to see the bonus Souppy and Kero pieces, go down to the lower bottom right of the page and you'll see some Japanese writing with a big wing under it. Click on that to see them.
If you click on the Mokona with the chess box, you can see the chess board too.
There's lots more to see on this site. They have the pictures of all the Clamp anniversary pins, the keychains, and quite a bit more. Wish I could read Kanji!