There have been a number of rumours about the iPhone 4S, but it seems that the device will never go on sale and will remain, at least for the foreseeable future, just a development platform as it was originally meant to be.
9to5Mac was credited as the first source to come up with the iPhone 4S name, which does not follow Apple's usual nomenclature (iPhone 3, 3GS, 4, 4S) and the site clearly indicates that it was a prototype that was intended to be used by developers.
It is, to put it simply, the equivalent of Qualcomm Mobile Development Platform; cutting edge hardware with the latest software but only for developers and partners.
But just three weeks later, Forbes quoted Jeffries & Co. analyst Peter Misek saying that the next iPhone would be called the iPhone 4S and would be a minor revamp of the iPhone 4, like the iPhone 3G and the iPhone 3GS.
It wouldn't surprise us if the iPhone 4S and the iPhone 5 are one and same phone with the former being the codename of the latter internally.
What can we expect from it? Apart from iOS 5, it will come with that Apple A5 system on chip, possibly a better camera, the Qualcomm Gobi baseband chip to make it a true world phone and, we hope, NFC capability.