There is a new version available of the Microsoft Remote Desktop App for Windows Phone 8.1
The new features in this release are:
Pinning apps to the Start Screen
The ability to pin separate Remote Apps on the Start Screen of your Windows Phone
Background refresh and notifications
If the list of apps available to you has changed (for example when your IT admin publishes new apps), then the list of apps on the apps pivot will be updated to reflect the changes which could include adding or removing entries.
Source & more info: http://blogs.msdn.com/b/rds/archive/2014/12/22/microsoft-remote-desktop-preview-v8-1-7-update-for-windows-phone-8-1-available-today-for-download.aspx