ARRRGHHH!!! You can't claim to change the way we game with episodic content and just stop after two episodes. Maybe it's gone the "Firefly/Serenity" route and they're just going to release a full fledged Half-Life 3. OR, maybe it's Valve's first mmo (though I doubt it).
Either way, I'm sure we won't be disappointed by what we receive, rather what we didn't receive (HL2:EP3).