Valve fansite ValveTime.net reveals a massive concept art leak from an anonymous source composed of 33 concept art images. The Images Include a variety of people and locations: * a redesigned Alyx wearing her father’s vest. * A man, possibly Gordon Freeman in a hooded winter jacket. * The helicopter from the end of Episode Two is seen crashed in an Arctic environment with Combine architecture visible in the distance. * A redesigned psychedelic-inspired Xen, including one with an Advisor. Detective work by Half-Life community LambdaGeneration revealed the source of the leak was Valve artist Andrea Wicklund’s online portfolio and the upload date was mid-March 2008. Once discovered, the images were quickly taken down.
Source: Half-Life Wiki