Heilemann said:

It said Webberg whereever I was reading about it; I swear!

Check out the Deathstar. See anything out of the ordinary? Must be a production painting or something; I don't have any of my books at my disposal, but I seem to remember seeing drawings or paintings of it with the superlaser on the axis before, but don't recall this particular one.

Good call. This is an unused matte painting. Once ILM and Lucas changed the design, they didn't have time to change the graphic for the briefing as Jambe said. They also replaced these mattes with physical models.