Warning! Spoilers ahead!
"Valve's episodic gaming plan has brought one unintended bonus to gaming: gossip. The abrupt endings and foreshadowing of Half-Life 2's episodes are perfect petri dishes for ideas and speculation to flower. And we're nurturing them right here.
Note: the 'facts' here are educated guesses. We have had a word in Valve's ear on more than one occassion, but we'll let you make up you own mind."