idk - I like that it was released as a companion piece so we can see ONLY the changes without going through the entire book... but they should have simply released this side-by-side with an updated document with the changes included. It shouldn't be difficult to re-author the original file with the changes included so there is still a single "core book."
I feel like the main composition of the book (the order the different subjects are in) should remain constant through the beta, or at least wait until the final revisions before bothering with changing that up because it is going to cause confusion to people in the beta to find their points again in the midst of other book updates.