This is a Julian Assange update. He, apparently, did a radio interview with Sean Hannity on December 15. It does sound like him, but I'll point out that the strong Australian accent that he has makes his voice easier to mimic than a nondescript voice.
So, I say that without seeing him there is still no proof of life.
But, the other thing is that they started the interview by discussing whether the Russians hacked the emails, and they didn't even address the worldwide concern about his safety and whereabouts. How could they do that? Wouldn't he start by assuring people that he is OK and explaining why he hasn't appeared at the window, etc.? He did't do that, so as far as I am concerned, there is still no proof that he is OK or that that was even him. I hope it was, but there is no certainty.