According to Game Informer,
the highly anticipated Half-Life 2 Episode One
expansion episode will be released on May 31 for $19.99. I hope this is true as I've been waiting for some more Half-Life 2
content and to see what happened after you take down the Citadel. The news also says Valve's Gabe Newell finished the episode in seven hours. There's already talk that Episode Two has been in the works for a while so hopefully it won't be long after Episode One is released that we can take on the next installment.
Thanks Blues News