Don't know if this has been posted yet so here ya go! http://techcrunch.com/2012/08/02/apples-iphone-52-prototype/ A comment below the article states: "Someone correct me if I'm wrong. At any rate, these identifiers are based on CPU architecture changes, the same as Apple's other products (i.e. Macs). First number is a major change, second number is a minor change. I don't believe Apple has ever skipped a major revision number but they have skipped minor revisions (Verizon 4 is an example). And yes, the original iPhone and 3G were essentially the same phone on the inside, aside from the 3G/GPS antenna." Is this true?