Much of what comes on the CD for AR/S&T/MapPoint is the map data. Therefore it is shipped as a new product.
So yes there is an update but it is called "AutoRoute 2013". Yes that means buying a new disk (or download), but if you bought the version that includes a GPS receiver, you only need the disk this time - it will work fine with your old GPS receiver.
Richard Marsden
MapPoint Add-ins at Mapping-Tools.com