Make sure you read Macworld UK's complete guide to all the iPhone 6 rumours including leaked images, launch date speculation and more by clicking this link

While Amazon has been busy launching its Amazon smartphone, speculation about the iPhone 6 is only hotting up.

Undoubtedly, the iPhone 6 is one of the most anticipated smartphones of this year, and so many rumours are swirling around about its imminent arrival.

Here is a round up of what we have heard so far and what the new phone is going to look like.

And, we have got some pics to gawk at too, which you can see on our iPhone 6 leaked images page.

So, when is the iPhone 6 coming out?

Without beating about the bush, the new iPhone 6 should be released around September/October 2014. If you remember, it was rumoured that Apple would launch the next generation iPhone at its WWDC (Worldwide Developers Conference) keynote on 2 June. Apple instead used the event to unveil iOS 8 and OS X 10.10 Yosemite.

Another rumour, which comes from unidentified supply-chain sources who spoke with Taiwanese media, is that the iPhone 6 will now launch in August, according to Reuters. That's a month earlier than we expected and a little unusual. The reports also suggest that a larger model with a 5.5- or 5.6in screen will then arrive in September, but again, the idea that Apple will launch two iPhones so close together seems unlikely.

iPhone 6: Rumours at a glance

iPhone 6 Release date: September 2014

iPhone 6 Screen sizes: 4.7- to 5.5-inches (or both)

iPhone 6 Price: Same as existing

iPhone 6 possible new features:

Up to 128GB internal storage or expandable storage

Better camera

New iOS 8 operating system

Heart rate EarPods

NFC chip

A8 processor

Wireless charging

Will work with Apple's rumoured iWatch

Sapphire glass and LiquidMetal design

iPhone 6 rumours: Screen size

Rumours suggest that the iPhone 6 will be bigger than the iPhone 5s, and there are a surprisingly large number of reports that say we'll get two new iPhones this year, with one of those iPhones falling into the 'Phablet' category.

Among those set on the idea that Apple is working on a bigger iPhone is KGI analyst Ming-Chi Kuo, who has a very impressive track record when it comes to predicting Apple launches. He expects two new iPhones to arrive this autumn, one with a 4.7in display and the other with a 5.5in display.

Others have repeated the same rumour and said that we should expect a 4.7in and 5.5in iPhone, including UBS analyst Steve Milunovich, Piper Jaffray analyst Gene Munster and several other analysts, as well as Reuters and The Wall Street Journal.

The latest rumours from the supply chain say that Foxconn, Apple's main manufacturing partner, will be building the majority of Apple's 4.7in and 5.5in iPhones, while Wistron will be responsible for building Apple's 4in iPhone, which could simply be a continuation of the iPhone 5s.

Plus, images reportedly confirming a bigger iPhone emerged in May, showing what is claimed to be the official schematics for the iPhone 6 that have been leaked from Apple supplier Foxconn. The dimensions of the iPhone 6 shown are 138 by 67 mm, compared with the 123.8 by 58.6mm of the iPhone 5s.

iPhone 6 rumours: Design

It looks certain that the iPhone 6 will have a bit of a new design. The latest rumours and leaked images suggest that the iPhone 6 will have little or no bezels, and many suggest that the iPhone 6 will have a thinner, lighter chassis.

The thinner, lighter chassis could be made possible with the use of Liquidmetal, a material that Apple has exclusive rights to. It's extremely strong and durable and interestingly, Apple has recently extended its exclusive license to use Liquidmetal in its products, adding further evidence to this rumour.

It's also thought that Apple is planning to use Sapphire glass in the iPhone 6, which is a "virtually scratch free" and "nearly indestructible."

This rumour is backed up by Apple CEO Tim Cook's confirmation that the company has built a new factory in Arizona that is being used to manufacture the sapphire glass.

According to Digitaltrends.com, Apple has spent $578 million on a deal with GT Advanced technology, the sapphire glass maker, to speed up the development of sapphire glass displays destined for the iPhone 6.

A patent issued by the US Patent and Trademark Office in May covers the use of a Sapphire glass display and Liquidmetal bezel in a future iPhone, so a combination of those to materials it's certainly something that Apple is considering.

Apple design guru Jony Ive has also confirmed that the company is working with new materials for future devices, so LiquidMetal and sapphire seem likely.

Other design rumours include rounded edges more reminiscent of the latest iPod touch, as well as a relocated power button on the side of the device.

For more information about the iPhone 6's design, check out our iPhone 6 design rumours page.

iPhone 6 rumours: Price

We won't know the price of the iPhone 6 until Apple announces it, but it's thought that the firm will keep the same pricing system as the iPhone 5s for the next generation of iPhone. That means the iPhone 6 price will start at £549.

iPhone 6 rumours: iOS 8

One thing which isn't so hard to work out is that the iPhone 6 will almost certainly come pre-installed with iOS 8, Apple's latest mobile operating system which was unveiled at WWDC in June. You can find out more about what to expect from iOS 8 here.

iPhone 6 rumours: Camera

It's highly likely that the iPhone 6 will have a better camera than the iPhone 5s. The iPhone 5s has an 8-megapixel camera with an f/2.2 aperture, but rumour has it Apple is planning on boosting that to a 10-megapizel camera with an f/.8 aperture and an improve filter, according to Chinese website IT168.

Rather than adding loads of new pixels to the camera like some of its rivals, Apple is apparently going to focus its camera improvements in other areas such as image stabilisation and image enhancements.

iPhone 6 rumours: NFC?

It is possible that the iPhone 6 could feature some sort of NFC chip.

Macworld UK has reported on Apple filing for a new patent covering NFC, that could be used for mobile payments and also for iPhones to talk to each other.

Analyst Ming-Chi Kuo also thinks NFC is on the way with the iPhone 6, and in May, a new note from Morgan Stanley analysts suggests that NFC will work with the Touch ID sensor in the iPhone 6, and that Apple will be the force that drives NFC's widespread commercial adoption for mobile payments.

"NXP is well positioned to participate in Apple's mobile payments ecosystem," said Hettenbach, explaining that NXP is expected to provide the NFC technology for Apple. "The company signed a licensing agreement with a customer in Q4'13, who we believe is Apple, related to its emerging ID business."

iPhone 6 to have 128GB storage?

Until now Apple has set the top limit of its smartphone storage at 64GB. The company has already expanded the storage of the iPad to offer a 128GB option, so it's quite possible that Apple will choose to do the same with the iPhone this year.

iPhone 6 rumours: Heart rate & Lightning EarPods

Instead of sticking a heart rate monitor on the back of the phone like the Samsung Galaxy S5, Apple is rumoured to be integrating the technology into its EarPod headphone. According to secret.ly, they will also measure blood pressure and iBeacons to avoid losing them.

"Apple's new EarPods will have sensors in them, for heart rate & blood pressure. Also iBeacons so they don't get lost. They will require the lightning port, it's why the audio jack was moved to the bottom," says the site.

The iPhone 6 could be thinner than the iPhone 5s thanks to the lack of a 3.5mm headphone jack, too, according to speculation that sparked from Apple's announcement of a Lightning-enabled headphone standard.

During WWDC 2014, Apple revealed a new program that allows third-party manufacturers to make headphones that connect to iOS devices via the Lightning port. This could potentially lead to the removal of the 3.5mm headphone jack, which is the thickest component in the iPhone 5S.

iPhone 6 rumours: Wireless Charging

Apple's big rival, Samsung, already has the feature and other smartphones are sure to catch up soon also. Will Apple introduce wireless charging with the iPhone 6? It is likely but no real evidence exists to back this up yet.