As i have seen in a previous post made by Bert Bates they will not be doing a head first book on ejb 3. But he has said that maybe some one will pick up to do a head first book on ejb 3 in the time to come.
That's so sad... The only book that I purchase for Java certifications is Sierra and Bates author. The reason is that it is easy to understand and it will really stick to your head. Anyways, I'll still wait if they will change their mind and create HF EJB 3.0