Rumors of Half-Life 3

Check out the article here at Game Informer. 

"According to his resume, Episode Three was put on hold when Valve decided to move away from the episodic model in late 2007, right after Episode Two’s release. He was a techinal advisor on a cancelled Half-Life title, made outside of the company. Dussault’s work on Half-Life 3′s world programming, and the scripting system (between 2008 and 2010) is also mentioned in the resume." - IGN