User blog comment:Rappy 4187/Technical Update: November 2, 2016/@comment-5558012-20161103150423/@comment-126761-20161103153520

Are you referring to the  diff? If so, I believe it's essentially a 'minified' bundle of the rest of the DesignSystem files - so you can see the actual changes listed out in those instead. (The minified version has few spaces and no linebreaks, so doesn't make for good diffs.)