For those who were wondering, this is the poster that comes with the March issue of Magazine SPECIAL, it features the color page of Chapter 211:

The magazine goes on sale tomorrow in Japan.

Also, cardcaptorkiki-chan has scanned the cover and box case of XXXHOLiC #14 OAD limited edition, make sure to check out the new OAD box case here.

EDIT: Bigger version can be found here, courtesy of Hane no Akari.

EDIT 2: Even bigger version can be found here, courtesy of cardcaptorkiki.