This question has been posted frequently! I do recall one thread being continued till pages, 1 year back! Reza Rehman, author of EJB3.0 in action had mneitoned something of having talked to 'help' writing the hfejb3.0 book. But i don't think it go anywhere.
more on this - here
Yes, instead of waiting for the book better read all the stuff menitoned in the links. EJB3.0 is a good book. for JPA once can refer the book from Apress.