It was bound to happen sooner or later, and it appears that Apple is making preparations for the eventual T-Mobile iPhone 4.
A report by BGR says that a T-Mobile-enabled iPhone prototype has been leaked with some interesting feature speculation. It is possibly utilizing the A5 chip like the one in the fabled iPhone 4S, according to 9to5Mac. The prototype is dubbed "N94" following the Verizon "N92."
Here are some leaked images courtesy of BGR:
