Not that I have a valid source for 2014 but I remember people saying that that's what the developers would aim for back when TW2 came out. They have a bigger team now. I think they're also working on 2 downloadable only games. I think 2014 is reasonable though. It's 3 years after TW2 with a bigger team.
They're making a whole new team for the cyberpunk game. While they haven't officially announced TW3 is even being made, the consensus seems to be that they'll have two full teams - one working on Cyberpunk and one on TW3.
I'd agree with 2014 estimate... likely on PC and next gen consoles at the same time.
2014. That's a year more than a normal production time (ex: Uncharted, inFamous, etc), they've already made the engine, and it was referenced in a release sheet that came out a while ago. Plus, I can't wait till '15...I need to fight Nilfgaard today!