Hello, Half life 2 episode 3 is expected to come out at the end of this year or august.... but this is a Interview with doug lombardi (Maker of steam and vavle)
about half life 2 franchise (episode 3)

Doug Lombardi and Chet Faliszek have talked at length with Shacknews about Left 4 Dead, but Lombardi did drop a hint about the Half-Life series:


Shack: Most of us were not expecting Left 4 Dead 2 to show up at E3. You guys had teased more information on Half-Life 2: Episode 3 earlier in the year. Should we expect more on that soon?

Doug Lombardi: [laughs] Don't have a new date. Since we missed the last time, I'm not gonna put out another one. I've said this before, but Freeman's not done with his adventure. Stay tuned for more.


There is also a whole load of information regarding Left 4 Dead 1 and Left 4 Dead 2, perhaps the best bit of info is that 4 v 4 matchmaking will be coming to Left 4 Dead 1 sometime this month. Doug also commented on the sequel nature of Left 4 Dead 2:


Shack: What price-point should we expect?

Doug Lombardi: This is a full sequel.

Shack: So full price?

Doug Lombardi: Yeah. At the end of the day, this is going to be a bigger game than Left 4 Dead. It's five campaigns versus four, all five are playable in Versus mode, Survival mode out of the box, the new multiplayer game mode. Plus over 20 new weapons and items. It's a full sequel.