In an interview with GTTV, Gabe Newell shares some information about Episode Three and an “Oranger Box”:
GTTV: Episode 3. What do we know about it? What can you tell us?
Gabe: From our point of view there’s enough newness in there that we want to sort of spring it on people and say “here’s a bunch of things you’ve never seen before” — we have multiple of those.
GTTV: And that’s graphically, or in terms of the gameplay, or…
Gabe: There’s stuff that visually hasn’t been in games before and there’s certainly a bunch of game elements on the order of Portal, that have never been done before.
GTTV: So even better than the portal gun?
Gabe: Oh yeah.
GTTV: Really? New gameplay paradigms?
Gabe: Uh-huh. I think that we’re really happy with how the Orange Box did, and we’d do an Oranger Box next time, certainly.