It has been mentioned to me by people who usually know, that lot 44 of Skinner's April 2014 sale has been recently certified by a famous London expert as an authentic Joseph Guarnieri del Gesu. I heard the buyer is rather pleased with his purchase. 
There are dozens of experts who held the violin in their hands who are now scratching their heads. (speaking of heads, I understand that this one is not original).
Jesse