Before I go off on random thoughts, does the radioshack only provide sales for the big US carriers shown here? I'm asking because they wouldn't need to show a 4s in there inventory if they don't provide sales for companies that do prepaid service. On with my randoms thoughts in response to what you wrote:
This is really what Apple has been saying for the past year. The execs had to present numbers to there investors in the past year that revealed a truth, that android is taking over in very important markets outside of the United States. Notice the number of stores popping up in Asia? I can pull the quote from May where they talk about Apples desire to open up shop all over the world. They've done what they said they'd do in initiating this whole new market penetration process. It was important for Apple to get more involved in providing for a wider variety of carriers and that is what the 4s is for. It'll be a lot like you said regarding the specs and of course it will lack many iOS 5 features that iPhone 5 users will get to enjoy such as voice assistance. What will make it different from a 4 that justifies the s denotation? You already said it in the world chip. 4s (s for savings, just kidding

) has to have a slightly modified name because in essence it is a slightly modified phone. Think about what the CFO has already said though "future product transition". We're about to see that Apple has a whole new plan for finally getting themselves into every untapped market they can think of. It's brilliant if they actually go full steam for it.
I had to edit this in because I randomly thought of it. That crappy picture of the 4s backing that looked kinda plastic instead of glass...yeah the 4s could have a plastic back instead because the glass is breakable and plastic is probably cheaper, more durable, and sooooo easy to swap out on the design. I'm taking it far on this thread, but I like being bold in my predictions.