It looks like the recent success of Linux gaming
has caught Blizzard's eye. According to "a reliable source at the company" 2013 will be the year that "at least one of their very popular titles will see a release for Ubuntu Linux
." From the article: "It's been a poorly-kept secret that Blizzard has a native Linux client of World of Warcraft. As recently as 2011, the World of Warcraft Linux client was still being maintained internally. The client has been around for years and done by their own developers as a form of testing for the popular MMORPG currently offered on Windows and Mac OS X. As for why they haven't released the client, it's come down to "targeting a specific version of the platform" with Linux being "unstandardized" due to the many different distributions. There's still some fundamental problems with gaming on Linux. With World of Warcraft working generally fine under Wine as well, the company is further unmotivated to officially support a Linux build of the game."