Prototype iPhone N94 back plat gets leaked?

MacPost has received what, if authentic, appears to be the back plate of Apple's iPhone N94 prototype. Whether N94 is iPhone 5 or an updated iPhone 4 or iPhone 4S is unknown.
The codename ‘N94′ marked on cover clearly indicates that it is a fifth-generation iPhone part. The front cover, however, is labeled “EVT2″ (Engineering Verification Testing) with date ’07-June-2011′, marking it as early development prototype.
Code references to N93 and N94 were discovered a while ago by 9to5Mac, and seen in the wild (and on T-Mobile) by BGR and while MacCast ascribes them to perhaps GSM and CDMA variants of iPhone 5, it might be too early to tell at this point. However, if these represent iPhone 5, they're a far more conservative update than recent case leaks, and renders commissioned by MacRumors would have suggested.
TiPb also heard previously that Apple has a lower-end budget iPhone or iPhone nano ready to go for this year, making the mix even harder to predict than usual.
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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.