http://thehackernews.com/2015/11/fbi-tor-unmask.html
The Carnegie Mellon talk detailed a new way to "de-anonymize hundreds of thousands of Tor [users] and thousands of Hidden Services [underground sites] within a couple of months" using just $3,000 of hardware.
This was patched over a year ago... The article is just about the recent court release making it pretty clear how they caught the SR people.