Sprint has released an update for their Music Store phone application, available on Power Vision phones. This update is required, you cannot access the Sprint Music Store or Music Store Player until you install this update. While a full change list has not been released (and there do not appear to be any plans to release such a list), several improvements can be seen in loading and animations inside the application.
The Music Store application will prompt users for update upon launching the Music Store application on a Power Vision phone.