The original ColdBox book is still at version 2.6.3. The framework is now at 3.5.3 and yes, a lot has changed.
We haven't had a chance to update that book as we've been working on the CacheBox book we released as well as some other upcoming book projects.
The original book still has value for getting you familiar with the framework, but the latest source of information regarding the framework is the online docs which are very much up-to-date.
Also, this list is a great resource for answering your questions