iPhone 6 and the iPhone 5S are two different phones
The rumour mill doesn't seem too sure whether the next iPhone is going to be the iPhone 5S or the iPhone 6. Given the iPhone's history - from the 3G onwards, there's always been a half-step S model before the next numbered iPhone - we'd bet on an iPhone 5S first and an iPhone 6 a few months later.
It's been suggested that there could even be three size variants of the new iPhone - check out these mocked up images by artist Peter Zigich. He calls the handsets iPhone 6 Mini, iPhone 6 & iPhone 6 XL.
Could we see both an iPhone 5S and iPhone 6 this year?
It's quite likely that Apple is moving to a two-phones-per-year upgrade cycle, but we'd bet on a springtime 5S model and a bigger, iPhone 6, update in the Autumn, probably September.
Even Digitimes reckons a springtime iPhone 6 is unlikely: it's predicting a summertime reveal for Apple's next generation phones, which again fits with a WWDC unveiling.
iPhone 6 cases
Multiple rumours say Apple's working on plastic cases for its next iPhone, mixing plastic and metal in such a way that "the internal metal parts [are] able to be seen from outside through special design."
It's unclear whether such cases would be for the iPhone 5S or iPhone 6, or if Apple is simply considering making cheaper iPhone 4s to sell when the iPhone 3GS reaches the end of its life.
Speaking in March 2013, a KGI analyst said it believed Apple would turn to manufacturer Pegatron to make up to 75 per cent of low cost iPhone products.
The iPhone 6 will finally do NFC
That's what iDownloadblog reckons, quoting Jefferies analyst Peter Misek: it'll have a better battery too, he says.
The iPhone 6 will run iOS 7 and the iPhone 5S probably won't
Developers are seeing new iPhone model identifiers in their server logs: the device identifies itself as the iPhone 6,1 (the iPhone 5 is 5,1 or 5,2) running iOS 7, and its IP address is an Apple one. If the two-phones strategy is true, we'd expect Apple to unveil the next major revision of iOS at its WWDC conference in June, with it shipping on the iPhone 6 a few months later.
iPhone 6 storage
We've already seen a 128GB iPad, so why not a 128GB iPhone 6? Yes, it'll cost a fortune, but high-spending early adopters love this stuff.
iPhone 6 home button
According to Business Insider, of the many iPhone 6 prototypes Apple has made, one has a giant Retina+ IGZO display and a "new form factor with no home button. Gesture control is also possibly included" - more on that shortly. Mind you, it was mooted that Apple would dump the home button in time for iPhone 5, but it never happened.
iPhone 6 screen
Take this one with a pinch of salt, because China Times isn't always right: it reckons the codename iPhone Math, which may be a mistranslation of iPhone+, will have a 4.8-inch display. The same report suggests that Apple will release multiple handsets throughout the year over and above the iPhone 5S and 6, which seems a bit far-fetched to us.
Not a huge surprise, this one: the current processor is a dual-core A6, and the next one will be a quad-core A7. The big sell here is more power with better efficiency, which should help battery life.
Expect to see it in the 2013 iPad first, and expect to see an improved A6 processor, the A6X, in the iPhone 5S.
iPhone 6 camera
Apple's bought camera sensors from Sony before, and this year we're going to see a new, 13-megapixel sensor that takes up less room without compromising image quality.
iPhone 6 eye tracking
One thing seems certain - Apple can't ignore the massive movement towards eye-tracking tech from other vendors, especially Samsung. It seems a shoe-in that Apple will deliver some kind of motion tech within the next iPhone, probably from uMoove.
The new iPhone will have better 4G LTE
On its UK launch, just one UK network had 4G LTE: Everything Everywhere, which currently offers 4G on the 1800MHz band. In 2013, all the other big names will be coming on board, offering 4G in other frequency bands. International iPhones already work across different 4G bands to the UK, so you can expect the UK iPhone 6 (and possibly the iPhone 5S) to be more promiscuous than the iPhone 5.
Wireless charging still isn't mainstream. Could Apple help give it a push? CP Tech reports that Apple has filed a patent for efficient wireless charging, but then again Apple has filed patents for pretty much anything imaginable.
The tasty bit of this particular patent is that Apple's tech wouldn't just charge one device, but multiple ones.