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!
[9to5Mac]
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Rene Ritchie is one of the most respected Apple analysts in the business, reaching a combined audience of over 40 million readers a month. His YouTube channel, Vector, has over 90 thousand subscribers and 14 million views and his podcasts, including Debug, have been downloaded over 20 million times. He also regularly co-hosts MacBreak Weekly for the TWiT network and co-hosted CES Live! and Talk Mobile. Based in Montreal, Rene is a former director of product marketing, web developer, and graphic designer. He's authored several books and appeared on numerous television and radio segments to discuss Apple and the technology industry. When not working, he likes to cook, grapple, and spend time with his friends and family.