I'm not sure about a new study guide, but there are lot of books on JEE6 so you can get a basic idea on whats new JEE6, with regards to the study guides you have in hand,
EJB is the main concern as i know, apart from Cade's book other books got the old version of EJB 2.1 but other content is very good, my suggestion is, better to get an idea on the main changes from JEE5 to JEE6 in the exam context, for the new changes use EE6 tutorial or some books and for other areas you can still use existing study guides.