Looks like BGR has some interesting photos which show that Apple is testing an iPhone prototype on the T-Mobile USA network. This could be the next iPhone 5 displayed in an iPhone 4 shell. The build model is N94. The Verizon model was N92 and the Original iPhone 4 was N90. We can also see that the proximity sensor is in a different location and the device is running an internal build of iOS 4 which test applicaitons like Radar and Apple’s Employee directory app. Hopefully this device gets released soon, most likely we will see the iPhone 4 or iPhone 5 on T-Mobile USA when Apple’s make their next announcement. Regardless T-Mobile USA folks will get their hands on a device in the next year with the T-Mobile & AT&T merger.
As soon as we have more information we will post it.