They have done a presentation at the 31C3 a few days ago on this presenting their findings in more details & Q/E (http://media.ccc.de/browse/congress/2014/31c3_-_6173_-_en_-_... ).

What I understood from that - it worked quite well with code bases like from the Google Code Jam (large LoC, no style guides etc), but not that well with smaller amounts of code and I'm looking forward to some additional results e.g. with a codebase from a corporate development environment.