This is great for everyone that wants to use music from a premium streaming service such as Spotify, Amazon Music, Apple Music etc.
The downside is that the game won't know the metadata of what's being played, but there might be a way round that.
The game will of course still be able to use your local music on your hard drive or network, and will also be able to play to internet radio station.
More updates soon.
Btw, if you're feeling excited, you can pre-order the game here.