Unfortunately, most of the apps will need to be updated by the app create to support the resolutions on the front screen. Samsung did a great job getting their 1st party apps to support it but we will see if it catches on in the developer community. I do see what you are saying about music/maps. That is more I on the Google side I suspect since their app is designed to show extra info on the bottom while using maps.
Great inputs for Samsung overall, hope they read it.