That's great to know, but I'm not sure it moves us any closer to a solution. It's already been established that devices that connect via "physical serial port, a virtual COM port bound to a GPS receiver via Bluetooth or USB, or a program COM port attached to a GPS intermediate driver on Windows Mobile devices (on Windows Mobile 5.0 & newer systems)" work fine, as they interact with the ESRI's GPS library in the expected fashion. The focus here (based on the original post) is these integrated devices that utilize direct calls to the Location API...
We for one, bought the tablet because it has an internal reciever and the prospect of connecting anything external somewhat defeats the purpose...