@Indunil, I think you might be confused about what we mean when we talk about a "diff view". We are not speaking about differences in features of various versions of our software, but rather of differences between different versions of content items. So, for example, if I add a new paragraph to a page about puppies, I should be able to see a side-by-side view of my page with the new paragraph clearly marked as a "new" addition. Please see this discussion for more information about the "diff view" and how it works.