Your oldest and longest running fanbase would like better communication.
The Half-Life 2 series was designed as three separate "Episodes", presumably with the intent of delivering content faster. HL2 Episode 1 was released in June 2006. Episode 2 was released in October 2007 (along with Team Fortress 2 and Portal in The Orange Box). It's been over 4 years since then, and there's still no word on Episode 3."