It's been dubbed 'World of MapCraft' and features slippy maps. It includes everything like Outland, dungeons and battlegrounds too. It even supports 'classic' versions.
Did you know Ragefire Chasm is internally referred to as Ogrimmar Lava Dungeon by the game? Henderson hasin getting 'World of MapCraft' up and running.
All the changes made to World of Warcraft through its expansions are also applied via the texture files, and you can even take a peek at what classic areas of the game looked like before Blizzard overhauled them. Check out the ambitiousproject for yourself and geek out. The detail is obviously stunning.