Biology books: Those have been getting very small changes over the last several years with each printing (last four for sure), so while the latest is theoretically best, you will be fine with anything from 2013 on.
Organic Chemistry books: Book 1 has essentially the same text (with some updated pages and some material removed) but has about 30% new passages and more biology examples. Book 2, IMHO, is the absolute best organic chemistry/biochemistry book anywhere by a long shot. It seriously is an amazing resource. Chapter 5 contains all of the new stuff they added to the exam and the passages/questions/explanations are incredible. Chapters 6-8 contain the high yield material with many useful shortcuts (there is no better way to find pI than the BR method) and the passages have a strong biology flavor. I believe the new books were available in December 2015, so if you have older books you really, really should update. There are used ones floating around, but make sure it's the new white and blue cover and that it say "Go Organic" on the back. The second book is the pride and joy of BR.
General Chemistry books: The new ones have been out for about a month, so you won't find many reviews yet. The text is about 80% the same as before, but sequenced differently. There are 12 chapters, but overall it's a shorter book in terms of content reading. The biggest change is in the passages and layout. We still have Phase I and Phase II for each chapter, but Phase III is a practice exam covering material from all sections. There are several new passages in the exams, and their is a focus on applications and experiments.
Physics books: The new ones I think are printed (if not, they will be finished any day now). Like the general chemistry books, the text is about 80% the same with a new sequence. There is a much bigger emphasis on shortcuts (tricks) and biological examples (like blood flow, electrophoresis, muscle tension, and so on.) Where it is vastly different from before is the addition of practice exams for Phase III. Phase III passages are tough and incorporate material from the entire book as well as biology.
Psychology book: New (obviously I suppose) and focused on terminology and experiments. The goal is to gain exposure to the vocabulary and typical examples of psychology, especially social psychology. There are sociology concepts in chapters 6 and 7, aimed at the overlap between the two fields. The reality is that we count on our teachers to guide the curriculum, which has resulted in some jaw-dropping averages for our classroom students. We have not done much in the way of data collection for people who just used the book.
CARS book: CARS people love to argue (and argue and argue), so this book which was due to be out late last year is still in its final revision cycle. Many of the poor passages have been tossed out and replaced by updated topics, but until the final version is done, everything floating around is literally the same book the last few years.
