I'm really stunned that we haven't heard anything by now...Back when Portal 2 was on the horizon, I just figured maybe they were just side-tracking HL3 for a bit so they could put all of their efforts into Portal 2, and that we'd get HL3 2-3 years after that...
But now Portal 2 has been out for more than 4 years (Already!?), and we've still got nothing...
It's certainly worrying...I'm curious how much work was completed and how much of the stuff from 2007 is even still around, if the game is even being worked on at all at this point. If it ever does get announced, I hope it's at somebody's E3 Conference, it would break the internet even harder than the Shenmue 3/FFVII combo.