I remember in the Gamespot interview, it was said that Aftermath's length was still being tuned. So, this would explain the recent November timeframe (of course they said before the end of the year, so my end of summer release theory was a little off). But, if we won't have it until November, I'm hoping AM will be a little longer than 33% of HL2. Also, I've been running a little theory. If they stick to a November timeframe, Valve will have shown itself capable of developing an episode within a year's time. I wonder, if they'll release "episodic" content every year or so until HL3's release, and separate levels that showcase the new tech, which would rock. Anyway, those are my speculations.