Apple has released likely the last version of iOS 8.4 before it rolls out iOS 9 sometime next month.
While there are few user-facing improvements, it appears all of iOS 8.4.1’s changes involve Apple Music, which was released on June 30th.
Much of the list involves syncing, iCloud Music Library, and offline music. Another major issue resolved has been affecting much of the team here: the inability to “love” a track while listening to Beats 1. Doing so influences Apple Music’s “For You” recommendation algorithm.
To download iOS 8.4.1, head to Settings, General, Software update.