Animate will host a traveling exhibit of GATE 7 reproductions to celebrate the release of Volume 1. There will be limited edition GATE 7 clear files, wall scrolls, postcards, book covers, mirrors, straps, mugs, fans, screen cleaners, etc sold at each store. Each store will also be giving out message sheets from CLAMP for those who make purchases. There are a few images of the merchandise at CLAMP-NET. I'll post again if Animate has images of the other merchandise. Exhibit info can be found here.
Natalie.mu has a larger image of Volume 1's cover illustration