We're pleased to announce the grand opening of our new Concept Art gallery, highlighting the myriad characters, environments, and other artwork we create during the development of our games. We plan to update this page regularly with a wide variety of never-before-seen pieces of art reaching all the way back to Blizzard's early days, so be sure to check back often!

http://eu.blizzard.com/en-gb/community/conceptart/