T-Mobile iPhone 4, iPhone 4S, or iPhone 5?
9to5Mac has taken BGR's T-Mobile US iPhone leak and run with it, wondering out loud if it's an iPhone 4 variant, or if it may just have an Apple A5 chipset and be one of those "iPhone 4S" advanced gaming test units, or even an early iPhone 5 prototype? (No, not this one.)
Could well be a bit of all of the above; experimental internals packed up in the existing casing to test T-Mobile
Place your own speculation in the comments below!