With the new 'brazen' understanding, a person can be DF'd for not just breaking a scriptural wrong (example; fornication) but a simple WT rule 'if' you have a bad attitude and refused to comply.
Again, just for the sake of lurkers, so they don't think all posters on this board are stark raving bonkers:
The book has not been published yet. No one knows what it contains.
There was a letter to BOEs describing the introduction of a new term, "brazen conduct" to supplement/clarify the NWT term "loose conduct".
But that is all. Anything beyond that is pure, unadulterated, 100% speculation.
As of the current date, 8/26/2010, you will not be disfellowshipped for "holding hands during a prayer".
Will the new book provide new standards for disfellowshipping?
Maybe, maybe not.
No one knows until the book is published.