With this new version of the beta 12857, Blizzard has included in the Credits section, a lot of images of Artwork on Cataclysm. You may already know a lot about it but I'm sure there are things that you don't.
In this image you can see where the Artwork is located.
Perhaps the most remarkable, we have an artwork of the Tier 11 of Guerrero y Tier 11 of Hunter.
After the jump you have the whole gallery.