There are a number of tradebooks on Judas that are now appearing, and I will try to keep track of them (in addition to the academic books and articles) on my blog. If you hear of any appearing that you don't see me posting about, please let me know so that I can add them to my blog. Thanks in advance.
One tradebook that I have just heard about is Mr. Greenberg's book on Judas in the gospels and whether or not he really betrayed Jesus. Mr. Greenberg says no. His book has just been released and is called The Judas Brief. Mr. Greenberg is an attorney in NY city, but also a popular author who has written several controversial books on biblical topics. In his newest book on Judas and who really killed Jesus, he argues that "the Jewish authorities did not seek to have Jesus put to death and furthermore acted to save him and his followers and other innocent Jews from a crushing military assault by Roman soldiers. The true villain in all of this," says Greenberg, "was Herod Antipas, the Roman ruler of Galilee."
On his blog, he has posted his own reviews of Pagels-King and Kasser-Meyer-Wurst here and has a posting on the Gospel of Judas and its relationship with the Gospel of Mark here. He rightly notes that the Gospel of Judas is somehow connected to Mark.
I also discuss the connection between the Gospel of Judas and Mark in The Thirteenth Apostle. It is clear to me that the author of the Gospel of Judas knew and used the storyline from the Gospel of Mark as his basic story, particularly in terms of Mark's portrayal of the disciples of Jesus.