That's very odd. A year ago, Porcelli was being very definite that his survey had found NO spaces behind the walls of Tut's tomb.
[news.nationalgeographic.com]

And this paper just came out a couple of months ago: [www.sciencedirect.com]

Have to say, though, this is one case where my ingrained skepticism gets kicked right out the door by wishful thinking. It would be so cool if it were true! But I'm not terribly hopeful...