The book tries to be as database agnostic as possible. The book shows you how to set up your own database, and uses MySQL as an example, but other than that, all of the queries and code can be run on any database. So, while it does cover native queries and named queries, it doesn't provide any Oracle specific information for generating and executing Oracle stored procedures.
Having said that, I was thinking of doing a Hibernate Made Easy for WebSphere and DB2 book, and a Hibernate Made Easy for Oracle and MySQL, but I'm not sure when I'll have the time. We'll have to see how popular this edition is first.