There's never been an iTunes App on an iPad like there is on a desktop. So no change to be notified about or mentioned.
iCloud is a collection of services, one of which is iCloud Music Library. If you are subscribed to either Apple Music or iTunes Match, then your music may be in the iCloud Music Library.
If you want to have Music available when you don't have internet access, make sure all your music is synced from iTunes on a computer or downloaded onto the device from the iCloud Music Library if you are using it.
Add and download music, shows, and movies from the Apple Music catalog - Apple Support