James Robinson (well-known editor of the Nag Hammadi Library in English),
"The Secrets of Judas: The Story of the Misunderstood Disciple and His Lost Gospel". New York, Harper & Collins, 2007.
From the review by Dr. Jonathan Dolhenty, published in http://www.radicalacademy.com :
The original document, designated as "The Gospel of Judas," has been, according to Professor Robinson, "kept under wraps until now, to maximize its financial gain for its Swiss owners. The grand expose is being performed by the National Geographic Society, timed for the greatest public impact, right at Easter. Those on the inside have been bought off (no doubt with considerably more than thirty pieces of silver), and sworn to silence on a stack of Bibles -- or on a stack of papyrus leaves." Robinson's book was obviously rushed into print (there are citations from as late as February of this year) and I suspect this was done to predate National Geographic's "Grand Event" and provide a contextual background for it when it occurs.
I've just red an official Russian translation of the book and say thank you to Dr. Robinson for this honest research.