What is the difference in the two version of The Five Thousand Year Leap?

I have seen there are two versions of The Five Thousand Year Leap.  What is the difference?
There is one book that has been published by NCCS. Then there is another version that has a forward by Glenn Beck and it also has updated information from W. Cleon Skousen’s personal notes after the book was written. Also the statistics are current with 2006 data.