News flash: There's no HL3, so can we all move on? I'll bet they are working on a new IP of some sorts because that's Valve always doing something new....
You aren't serious, are you? There's no way Valve would be stupid enough to not make Half Life 3. I've said it before, but they'd be royally fucking themselves over if they just up and abandoned Half Life without saying a word. It would be the stupidest mistake ever.