I saw the new Robbins and I also asked the residents about it. I was told that the molecular pathology part is the thing that changed and updated. This includes the chapter of neoplasia and the molecular discussion of the diseases throughout the book. Minor changes made in other parts.
For me, I just got rid of my old Robbins. I sold it on Amazon!. I want now to buy the new one. Robbin is one of the books that you don't regret updating it.
For Board prep, no need to buy the new one, if you don't want to do so.
as the change sare not significant.
Robbins is good for medical pathology but not good for surgical pathology. Medical pathology includes medical pulmonary diseases such cystic fibrosis, emphysema..etc..medical renal diseases such as polycystic kidney diseases, glomerulopathies,..Genetic and pediatric diseases.....and so on. Robbins is one of the best in these things.
In sum, no need to buy the new edition for the Boards but update it for other things....