An alleged screenshot of Vodafone UK's till system reveals a listing for iPhone 6. So far the rumors about Apple's annual iPhone edition have taken off with the 5S title, as presumably it won't feature a design overhaul, but rather additional functionalities like a fingerprint sensor and a fancy flash for the upgraded camera, as well as a brand new iOS 7.
The image has been subsequently pulled by the source, but reappeared with the rest of the entries around the iPhone 6 listing blurred for added protection. If this episode turns out true, it might be a hint that either Apple has decided to ditch the bi-annual "S" upgrade letters, that indicate changes mostly under the hood, or it deems the new features of the upcoming iPhone to be a major turn, despite the rumored steady design approach.
Moreover, we also have the speculation about an affordable iPhone version, but what title will this one take in the end is anyone's guess at the moment.