Spoog-o-rific! Tig found a scan of pages from the latest pc gamer with 12 full pages on Half life 2! The first page is here. Change the filename from *_1.jpg to *_2.jpg all the way to _12.jpg for the rest of the article (I'm too lazy to create links right now :)
New game engine, awsome effects, not quite aimed at the doom3 crowd, but still good (playable on a p3-700 with a tnt2 all the way up to the latest and greatest), better AI, better effects, new AI system (muscle system, lip syncing, and realistic beast movement), lots of attention to light and reflections, in development since the original Half Life came out and best of all, it's going to be released in less than six months!