4.0.9 - Still said iTunes in my Play Pause workflow for me so I removed and rebuilt workflow but now is blank text and so added in my own title ?
However I dont know if this was the behaviour before but if I dont have music app launched and have previously played something.
Triggering to Play launches Music but doesnt start playing anything, you have to go into Music find something to play and then the trigger will work, I thought before it started playing something such as Favorites mix ?
FYI there is a number of references to iTunes in the UI of Prefs