Tomorrow, 6/30 (Tuesday), Apple make available the iOS 8.4 for all. As we have already said a few times, it will be necessary to install this new version of the mobile operating system to access the Apple Music, new service streaming from Apple music.
Normally the releases of new versions of iOS happen at 14 hours (for the time of Braslia), but we also already informed that with iOS 8.4 everything will be a little different due to the radio Beats 1.
And we're just getting started… # Beats1, broadcasting June 30th on Apple Music.
Posted by iTunes on Friday, June 26, 2015
In his blog, Ian Rogers (former CEO of Beats, who now works at Apple) confirmed that iOS 8.4 will be released at exactly noon, with Beats 1 going live an hour later (at 1 pm). Rogers later updated the post by removing the men at the time, but the internet never forgets.
iOS 9 & Apple Music
Apple executives also tried to clarify other points about Apple Music.

Eddy Cue (senior vice president of software and internet services) confirmed that a new beta version of iOS 9 will be released, gaining compatibility with Apple Music. Thus, even those who are testing the new system will be able to subscribe and enjoy Ma's musical service.
Music upload limit
Another point raised by Cue related to an Apple Music feature quite similar to iTunes Match. Here's what Apple says about it:
How does Apple Music know which songs are in my personal library?
With an Apple Music subscription, your entire library is on iCloud. We compare all the songs in your collection with those in the Apple Music library to see if we have the same songs. If we have, you can listen to the music directly from the cloud. Music that is not found in the Apple Music library we send to the cloud using iTunes on your Mac or PC. As everything is in iCloud, it doesn't take up space on your devices.
In summary, whoever subscribes to Apple Music is entitled to a feature exactly the same as iTunes Match, it is worth noting that iTunes Match will continue to be available to users who will not subscribe to Apple Music.

Currently the upload limit for songs that are in your personal library, but not in the iTunes Store / Apple Music catalog, is 25,000 tracks. Although the number remains the same for tomorrow's release, Cue said the company is working to raise that limit to 100,000 when iOS 9 is released.
Beats Music & Apple Music
Those who subscribe to Beats Music, which will be replaced by Apple Music, still do not know very well how this migration from one service to the next will happen. Cue also gave important information about this, saying that the Beats Music app will be updated to offer the migration to the user.
Sorry, app not found.
However, some important details are still unknown, such as whether even those who already pay for the Beats Music subscription can use Apple Music for three months at no cost (trial period).
Apple Music & Sonos
Another question that was answered by Apple has to do with Sonos speakers. They currently natively support Beats Music, but the company said Apple Music will not be supported in its release. Apple, however, has already confirmed that it is working with Sonos and that it plans to make the service available / compatible with speakers by the end of the year.
(via MacRumors, RazorianFly, 9to5Mac)