As previously reported, the new service is said to be integrated into the iOS Music app, retaining most of the functionality of the current Beats app. Apple is apparently prepping the music service to launch with a supposed iOS 8.4 update, though those plans could change, according to Mark Gurman of 9to5Mac:
Apple currently plans to launch the new music service as part of an iOS 8.4 upgrade for the iPhone, iPad, and iPod touch following WWDC, but a final decision has not yet been made. It's possible that the service will be bundled into iOS 9 this fall, which is expected to have a significant focus on bug fixes and stability improvements.
Also evidently on track for this year is a new model of the Apple TV. Set to debut later in 2015, the new Apple TV is said to be slimmer, with a new remote and a new operating system.
Sources say that Apple is also finishing up work on a slimmer Apple TV set-top-box with a more capable and tactile remote control and a redesigned operating system bundled with an App Store.
Apple is reportedly hoping to debut the new box with new content deals in place, possibly including a web-based TV service.
You can read more on Apple's rumored subscription service and upcoming Apple TV at 9to5Mac at the link below.