Half-Life 2 continuation . . .

When is the expansion pack of the 'HALF-LIFE 2' series coming out for the PC? I loved the game, so does anyone know? Is there even one in the making? 🙁

http://www.eurogamer.net/article.php?article_id=58579

"The news most of us have been waiting for has finally been confirmed: Valve is readying the first expansion pack for the unanimously acclaimed Half-Life 2. Provisionally titled 'Aftermath', the new adventures of Gordon Freeman and his able sidekick Alyx is tentatively scheduled for a 'summer' release only via Steam"

also.. gamespot did a Q&A on aftermath

http://www.gamespot.com/pc/action/halflife2aftermath/news.html?sid=6128325&mode=previews