From what I have been reading and seeing in videos, says that is wrong. It seems many people are willing to buy a book for one thing in it and the rest of the book goes unused. The "ethical" people that is, while others will do it the unethical way to get it; others still will not buy anything and use an SRD.
I refer back to the Lazy RPG Talk Show guy. That is something he would be more ready to discuss, but my understanding is:
You get 1 book you must buy as a player or use an SRD. Then it was that any book you bought would add full details for one of these new classes. It seeks this book changed that? He claims several times he works with Wizards and gets 0romotional matetial. Either that is a boikerplate disclaimer, or due to repeated mention in those 5 minutes, he has the product but must be under NDA until street date to reveal contents. What he revealed, however, was lack of contents he feels should have been present.