I don't have it. I just ordered it today, but I'll be getting it soon enough.
Either way, someone I know has seen it and has informed me that the book has four chapters, going from Black and White's journey through the Desert Resort, White setting up and showing off the Pokemon Musical, and Black's Gym battle against Elesa.
From what I know, they edited the scene where Skyla flies stuff for the Pokemon Musical on her cargo plane. In the original Japanese version, it said, in Engrish, "Let's Enjoy Musical" to the much more grammatically correct "Let's Enjoy the Pokemon Musical". It wasn't a perfect edit, though.
OK: Got the book, and the chapters are...
ABW022: To Make a Musical
ABW023: Special Delivery
ABW024: Battle on a Roller Coaster
And before anyone asks, no, they didn't edit Elesa's infamous entrance.