Boards and Wards came out with their 4th edition and it has new material and they got rid of those vertical placed charts in which you have to turn the book on it's side to read. They redid those and added more ENT, Derm and Optho material. I really like it.
I like Crush but it's pretty light on information. Brochard's other book, USMLE Secrets is a much better and more informative book. I don't know why anyone would reach Crush when Secrets is written by the same author but has more information and is presented better. I hope the new Crush is vastly improved. The good news is Adam Brochard seems to put a lot of effort in adding new material and making changes to each edition.