Preview at WWDC likely in June, followed by September launch.
Apple Seeds First iOS 8.4.1 Beta to Developers
Today's beta, build number 12H304, can be downloaded from the Apple Developer Center.
It is not yet clear what changes will be introduced with iOS 8.4.1, but as with past betas, it's likely to include bug fixes, performance enhancements, and minor tweaks to the operating system. We'll update this post with any new features or tweaks that are found within the new update.
iOS 8.4.1 follows on the heels of iOS 8.4, which introduced an entirely revamped Music app along with the new Apple Music service and the Beats 1 radio station. Aside from music updates, iOS 8.4 included only minor changes to iOS 8.