No, and that's the most frustrating thing. There's been no news for Episode 3 or HL3 since Episode 2 released.
Last year for the 8th anniversary of Orange Box releasing they "leaked" text files regarding Half-Life 3 into a Dota 2 update. Press call it a leak, but to me it seems an extremely obvious nod to the more desperate HL fans that tear into all updates looking for clues, especially since it was the day before / of the aniversary. They get to hint at ideas without having to speak about it or confirm anything.
http://www.valvetime.net/threads/what-are-the-leaked-hl3-txt-and-rpg-txt-files-all-about.246431/
Basically suggests there will be Quests, Ziplines and other stuff. VR stuff is mentioned also.
That is as close as you get to info, and I'd bet the reason for that is so they don't have to confirm or even talk about it - that way when there is inevitably more changes / restarts or whatever is going on - they can still say nothing.