Nowgamer reports that Counter-Strike creator Minh Le has confirmed that Half-Life 3 is being worked on.
"I think it's kind of public knowledge that people know that it is being worked on, so if I was to say 'yeah, I've seen some images' like some concept art of it that wouldn't be big news."
"I guess I could say that I did see something that could be in the Half-Life universe. I mean it wouldn't surprise anyone if I said yeah they're working on it."
"To go out on a limb, I would say I did see some Half-Life 3 concept art."
It was some time ago that Minh Le worked at Valve, and most recently he's worked on a game called Tactical Intervention in Korea. Take this for what it is - another vague confirmation that Valve hasn't left Gordon Freeman behind.