What does it bring that's new?! Well, it has been around (in First Edition form) for 3+ years, so it's nothing immediately new!! But if you're looking for differences, it's a traditional-style book with in-depth explanations and key diagrams, but no cartoons or distracting jokes. We find some people really prefer a straight no-nonsense route to learning the details of what needs to be known; others like to take a more entertaining approach. It's all down to personal preference, obviously. Some readers really like to do both: take a hands-on training or entertaining read route first, then solidify their understanding of the details with my book.
The Second Edition has brought a clearer layout and new formatting guidelines, errata corrections, new cover, and a few pages on what to expect in Java EE 6 when it finally gets released. There are a few exciting changes coming up which will eventually make themselves into a new SCWCD exam, but it won't be soon for sure. Nonetheless, they're briefly mentioned in the book. There are over 300 (fairly challenging) questions, designed to really make you think, and an online mock exam included.