Detailed Release Notes?
Downloaded Mac OS X 10.10.4 update and iOS 8.4 yesterday, and noticed some immediate changes to the music/iTunes apps. I'd like to understand what's new, and how to use the new features, but I'm not sure--are they documented anywhere? Example: In addition to the star ratings for music, there's now a "heart". What's that for, and how does it interact with the star ratings (if at all)?