I read today that Half-Life 2: Episode 2 has been delayed again. Considering that the whole point behind Valve's switch to episodic gaming was so that they could release new content on a regular basis, they've kinda screwed the pooch now in that regard. 6-8 Hours of gaming unpredictably every year-and-a-half to two years is not releasing new content on a regular basis.
Combined with the fact that the Sin: Episodes series flopped right out the gate with it's first episode, leading to doubt that will ever even be a second episode, and the whole thing seems to have gone down the plughole. The only hope remaining seems to lie with the Sam & Max series, which has actually released episodes on a regular basis with a reasonable modicum of success.