This is the Ace RC Thunder Tiger USB Programming Dongle for the GT5 flybarless controller. I am using this with my GT5.2. I am using a Mac for this, but Windows works the same way once you get the program installed.
This is a very nice way to set up the GT5. These should be available for purchase late March 2014 at Tower Hobbies.
Link for the USB Dongle:
Link for the software: