Given the iPhone's history - from the 3G onwards, there's always been a half-step S model before the next numbered iPhone - so it was no surprise the 5S was first and so we're looking at the second half of 2014 for a new iPhone 6.
Cut to the chase What is it? A major revision of the iPhone including entire design When is it out? September 2014, maybe as early as June What will it cost? Expect premium pricing for a premium smartphone
iPhone 6 release date
The iPhone 6 release date will be in 2014, although exactly when that will be in the year is still a little unclear.
Jefferies analyst Peter Misek says that there will be a June 2014 release for the iPhone 6. We reckon it will be later than that, around a year after the 5S.
Interestingly, in May 2013 Stuff reported it received a photo of the till system at a Vodafone UK store (which it has since removed along with the reference to Vodafone), with '4G iPhone 6' listed.
Apple has launched the last few iPhones at a special event in September, so the smart money is on September 2014 for the iPhone 6's arrival.
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". It will surely include Apple's new Touch ID finger print tech though?
iPhone 6 screen
The Retina+ Sharp IGZO display would have a 1080p Full HD resolution. It's also been widely reported that Apple could introduce two handset sizes as it seeks to compete with the plethora of Android devices now on the market.
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.
That said, there's still a small possibility of the iPhone 6 sporting a flexible wraparound display after more patents were uncovered, but we reckon that's more likely to feature on the iPhone 7 or 8 instead.
Jefferies analyst Peter Misek also says he believes the new iPhone will have a bigger screen. Different sizes also seem rather likely to us - the word on the street after WWDC 2013 was that there would be 4.7 and 5.7-inch versions.
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 (these look rather like the iPhone 5C variant though). However, as ZDNet rightly points out, different size variants aren't exactly easy to just magic out of thin air.
You can expect more premium metal to come your way with the iPhone 6 too, and Apple patents for liquidmetal 3D printing suggest there may be a new way to form the sultry chassis on the new iPhone.
That chassis could well be the thinnest yet - with word that Apple will slim down the svelte 7.6mm 5S body for the iPhone 6, and if leaked images of the phone's case are legit the handset may well be shockingly slender.
The iPhone 6 will finally do NFC
About time too. Well, that's what iDownloadblog reckons, quoting Jefferies analyst Peter Misek. Many Android phones now boast NFC and Apple appears to have been happy to be left behind here.
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.
See our video below on what Apple needs to do to slay Samsung's Galaxy S4
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The iPhone 6 will run iOS 8
With iOS 7 heading out of the traps now, who's betting against the next iPhone coming with iOS 8?
We'd expect a September or October release date for iOS 8 in line with previous releases.
iPhone 6 processor
Not a huge surprise, this one: the next processor one will be a quad-core A8 or an evolved A7. The big sell here is more power with better efficiency, which should help battery life.
Anyone hoping for some juicy Samsung technology hidden under the iPhone 6 body will be disappointed though, as reports suggest Apple is looking to push its Korean rival further out of the iPhone picture with its eighth-gen handset.
Apple is apparently cutting the amount of A8 processors it is having made by Samsung, although it hasn't severed ties completely just yet.
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. But that's not what everybody thinks.
The China Post, quoting a tip from the country's Nomura Security, claims that the next iPhone won't go for a 12 or 16-megapixel sensor, instead sticking to the existinh 8-megapixel unit. Expect optical image stabilisation and improved autofocus though. And maybe a better flash.
A patent confirms this, saying Apple's aim is to use "voice coil motor actuators" to move the lens around the optical axis.
An Apple patent, uncovered by Apple Insider in May 2013, shows a system where an iPhone can remotely control other illuminating devices - extra flashes. It would work in a similar manner to that seen in professional photography studios. Interesting stuff.
iPhone 6 Sapphire crystals
GT Advanced Technologies provides crystal grow equipment and materials for consumer electronics, among other industries and has announced that it's signed a multi-year supply agreement with Apple to provide sapphire materials.
Sapphire has figured prominently in recent Apple products - the iPhone 5S' Touch ID fingerprint reader features a cut sapphire crystal cover and the iPhone 5 was the first to feature a sapphire crystal lens.So what will we see in the iPhone 6? Certainly the Touch ID fingerprint reader, but also other scratch-proof materials. GT says it will own and operate the machinery to produce this stuff at a new Apple plant in Arizona.
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.
iPhone 6 wireless charging
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. Here are more details on the iPhone 6 wireless charging patent.
Meanwhile, a further Apple patent seems to imply that future iPhones will be able to adjust volume as you move them away from your ear.