I don't know if more information on the WT corp will be revealed from Ray or his direct "sources", but it is clear that Ray does not "tell" everything in his books. He, (understandably), avoids legally sensitive matters, and sticks to topics that would make a JW think twice, but the average person, (non-JW), would not bat an eye over. There is no way he could have dodged the corporation's legal arm for 30 years if he told everything. He tells enough for the average thinking person to connect the dots. The WT corporation knows that, and they leave him alone.
Ray was genuinely a good man, but he was "one" of them. He could only work within that status.
Jason