The poster over there notes that the box comes from her friend Gene, who supposedly works at a printing facility. Gene couldn't get one out of the printing factory, so instead he snapped an image of the box with his cellphone.
Through Paladin Schmaladin, we're also told that the printing press had the WotLK box orders pushed back four months. This could be an indication that Lich King will be coming out later than expected, although since Blizzard hasn't really announced a release date, we'd probably never know the difference.
Nonetheless, enjoy your nightly WotLK rumor. It looks to be a good one.
Click the image for a larger high-res version.