It has been rumored for a long time but now it is clear that Apple Music gets support for high definition audio or lossless audio. The support for high-resolution sound will be on 75 million songs, which is really nice, so it will not be on a small part of the catalog. The codec you use is ALAC (Apple Lossless Audio Codec).
The high-resolution music is available in varying degrees of high-resolution, starting with CD quality (16 bits, 44.1 kHz) but you can get up to 24 bits / 48 kHz on standard devices such as iPhones. Real audio nerds can get up to 24 bits / 192 kHz but then you need a USB-DAC. To get high resolution, you need to select it in the settings because it draws more bandwidth. High resolution should be included in the regular Apple Music subscription as we understand it.
Apple will also start working with songs that will have spatial sound. With the help of Dolby Atmos, you will be able to enjoy songs like standing in front of the band when they recorded the song. It’s required that the songs are remixed completely from the beginning for this purpose, so the entire catalog will not be listenable with this technology, from the start there will be a number of thousands of songs.
Both of these features will come to Apple Music next month and will not cost anything extra.