Much to BlackBerry-maker Research In Motion’s (RIM) chagrin, very few details on the company’s still-unannounced BlackBerry Bold “9700/Onyx/Driftwood” smartphone remain unknown. Due to high interest in this replacement for RIM’s current high-end Bold 9000 device, early device evaluators, AT&T field testers and other tipsters have been slowly dropping hints including specifications and images for months.

In fact, the first picture of the device codenamed Onyx/Driftwood and now thought to be RIM’s BlackBerry Bold 9700 first hit the Web back in May. At the time, the device was thought to be headed to both AT&T and T-Mobile. And recent events–namely a leaked AT&T pre-release device list and a picture of a T-Mobile branded Bold 9700–lend further credence to this theory.

If everything pans out as predicted, the BlackBerry Bold 9700 will be T-Mobile USA’s very first 3G BlackBerry.

The T-Mobile device, which will presumably differ from AT&T’s Bold 9700 because it will support UMA, or VoWi-Fi calling, and employ T-Mobile’s unique 1700 MHz 3G band, was reportedly codenamed “Driftwood.” AT&T’s new Bold is thought to have been codenamed “Onyx,” and it will likely use AT&T’s 1900 MHz band for 3G.

While it seems certain that the BlackBerry Bold 9700 will land on T-Mobile USA at…