I don't believe valve has planned since the original half life, to make a half life 2 episode 3. I feel as if their making the story up as they go along. What i would like to see, is someone create a story. And make a series of quality games made around that story. A totally original story. The games could be released at whatever intervals. But i really hope to see someone.(and i believe someone will one day.) Just really come up with an awesome story. Characters, plot, etc. And to take their time. And really carefully craft awesome gameplay around it. Series after series. I know it would take some time. and i understand why perhaps it hasn't been done. But i would really enjoy some finely crafted games linked with an incredible story. And from my limited knowledge. Valve looks like the only folks daring enough to do such a thing. I hope someone out there has something like this in the works. It would be a game for the ages.