Apple Music requires iOS 8.4 or later for access. The revamped Music app will launch publicly with iOS 8.4 at the end of June, 2015.
Those with iOS devices running older versions of iOS will not be able to listen to Apple Music unless they update.
Yes, Apple Music will be available on Android starting in fall 2015.
Beats Music subscribers have enjoyed access to the service on Android devices as well as on other platforms. Apple intends to continue this by offering Apple Music members an option to listen on Android devices.
Apple Music will officially launch on June 30, 2015. This date coincides with the public release of iOS 8.4.
At this time, existing Beats Music subscribers will be prompted to migrate their accounts to Apple Music directly from the Beats Music app.