Valve to port Source games to Linux?

Could Linux users one day play native ports of Half-Life 2 and Team Fortress 2 the same way they can Enemy Territory: Quake Wars today? Phoronix claims that it has "received information" that confirms Valve's plans to port its Source game engine to Linux:

This game engine, which first premiered in 2004 but continues to receive routine updates, is used for Valve's own popular titles and is licensed by other game studios. Among the Valve Source titles are Counter-Strike: Source, Half-Life 2, Day of Defeat: Source, Portal, and Team Fortress 2. Other Source-based games include The Crossing, Garry's Mod, Salvation, and The Kill Point: Game. This advanced game engine right now supports Windows, Xbox 360, and PlayStation 3 platforms, but no support for either Mac OS X or Linux.

Currently, the Source Engine uses Microsoft's DirectX API (support for version 8.1, 9.0, and 10.0 with Source Engine 2007). Though the Source engine's predecessor, GoldSrc, which in turn was based on the original Quake engine, was able to render both OpenGL and Direct3D. The Source Engine is designed to be highly modular, and this is hopefully how the OpenGL support will be introduced, which is needed for any Linux or Mac OS X support. The Source Engine does contain technological enhancements such as High Dynamic Range (HDR) rendering, a soft-particle system, an advanced AI system, and its physics capabilities originate from Havok 2.