Who's to say Episode 3 will have to be episodic in the sense that it will only be 3-5 hours? They have so many things to tie up and explain that HL2:E3 will likely be a "full-fledged" game as far as length goes. There a huge to-do list (which I won't mention specifics as they are almost all spoilers) that Valve has to take care of. They are probably still trying to tie up everything in Ep 3, and after they're done they have to playtest like crazy like they always do.
But it should be in the works. There was an escapist article if I remember correctly that talked abt Episode 3 and sign language. The sign language part was interesting, but what was more interesting was that it showed that Valve actually was working on Ep 3.... at least at some point.
But it should be in the works. There was an escapist article if I remember correctly that talked abt Episode 3 and sign language. The sign language part was interesting, but what was more interesting was that it showed that Valve actually was working on Ep 3.... at least at some point.