PaulS:
Seems unlikely, since the shield is not made by the Arduino people.
At http://labs.arduino.cc/GPRS/Index David Cuartielles and Gianluca Martino are mentioned as key people in the GPRS shield development and they are also labeled as "co-founders of the Arduino project" - so I thought the hard- and softwarepart would be covered by Arduino people. But perhaps this is an old level of information. 