It seems we won't have a new release of Head First EJB for a while.
Unfortunately, there's not a new release of Head First EJB planned. It's something we want - which is why Chris saw it in our internal databases - but not something we've been able to find authors for.
Because EJB 3.0 changed so drastically from EJB 2.0, it's not as much a revision as, in many respects, an entirely new book. And Bert Bates and Kathy Sierra have become too busy with several other projects (including the recently-released Head First Servlets, 2nd edition) to invest the time into a new edition of EJB.
All that said, we are actively looking for EJB authors, and it's a book that we'd like very much to sign. I know that's not a terribly exciting or encouraging answer, but I wanted to be up-front.
And anyone out there dying to get into the Head First family, EJB would be a great title to propose and audition for! Check out the Write For Us link at http://www.headfirstlabs.com.
Series Editor, Head First