eurogamer have a small article up focusing on the PC Gamer feature on the upcoming Half Life 2 - Aftermath.

The focus for Aftermath appears to break with the Half-Life tradition of presenting the storyline from the viewpoint of other key characters in the game, with the mooted Alyx-based episode apparently not happening as many of us imagined it might. Instead, it would appear that as a compromise, Alyx figures as a much more active partner of Gordon Freeman's adventures.

Full Half Life 2 Aftermath Article

UPDATE

Just noticed they also have an article about the specially designed Half-Life 2 level 'The Lost Coast'. This is the one thats going to show off those extra bells and whistles of the source engine, or at least it will if youve got a nice PC to play it on.

Half Life 2 The Lost Coast Article