The guy who leaked them, or allowed the scripts to be uploaded, or forgot them on his desk without locking them, or whatever is somebody working at the BBC Miami office named Marcelo Camagro. I wouldn’t want to be in his shoes, that’s for sure.
I would want to be in his shoes…so I could walk myself under a bus. What a dickhead!
I hope if he sold them or leaked them on purpose he gets fired. What a dickhead.
It’s not clear whose fault it is - this blog has more details:
If the screenshot in the blog is kosher, it looks like the first six episodes themselves were also publically available…
Looks more like he just didn’t understand how computers work.
I certainly wouldn’t leak a bunch of files where every single file name was my real name. 
I’d enjoy reading them if I can find them.
Why? to compare whats written to what gets on the screen. How the director and actors interpret the script.
I’m in possession of them, but I’m not reading them. (I may end up breaking, but the premier isn’t too far off). All I’ve heard is that they’re extremely Moffatastic.
It is unfortunate, looking back over the really good episodes, that like 90% of them are written by Moffat. And then sadder when you realize the remaining 10% was written by Davies. I think the only great episode written by anyone outside of those two (in the modern incarnation) is the Vincent Van Gogh episode.
They really need to find someone else who can spin a great Dr Who story, in case Moffat ever decides to step down.
Paul Cornell wrote the Human Nature two-parter (adapted from his own novel, granted) and Father’s Day. I wish he’d do more but I think he’s busy in comics these days.
It’s all a plot by The Master. Having given up on the idea of actually defeating The Doctor, The Master has decided to be content with just annoying him.
Update: the work prints of the first two episodes have been leaked. They’re watermarked black and white footage with incomplete CGI, but more or less the full episodes.