More voices were added to the snowballing iPhone 6 discourse, its 2014 release date supposedly gaining more ground as a new render and fresh details defining the hotly-anticipated handset came out.

First off, the projections provided by NDP DisplaySearch, suggesting that Apple is actually working on the rumoured device and is in fact testing two screen sizes prior to deployment.

DisplaySearch analyst David Hsieh reportedly got word from Asian sources, described by BGR as Apple suppliers, who in turn claimed that at this stage the iPhone 6 front screen could measure between 4.7-inch and 5.7-inch.

The report, however, did not clarify if the iOS phablet will eventually come out in two builds - one flashing a 720p screen resolution and the other a 1080p viewer.

An earlier scoop from The Wall Street Journal also revealed that the iPhone maker is tinkering with two possible screen dimensions for the iPhone 6. But Apple watchers are of the belief that in the end, the phablet will sport only one screen size.

Ming-chi Kuo of KGI Securities has earlier floated the idea that Apple will not go beyond the 5-inch mark, implying too that from the iPhone 5S's 4-inch, the front screen of the next iteration will only be stretched to as far as 4.5-inch.

And with the raging debate on how far Apple is willing to push the iPhone 6 screen, gadget concept designer Nikola Cirkovic's take on the bigger iPhone, though circulating for some two months now, seems to offer realistic perspective of the rumoured device.

Amazingly, the render accurately predicted the Touch ID that Apple has embedded underneath the now circular Home button in the iPhone 5S. The designer is clearly convinced that the tech giant is extending the same feature and look to the iPhone 6 on its release date next year.

The published images are somehow realistic - staying true to the existing iPhone template while accommodating the persistent talks that for the 2014 build, Apple will employ a screen that overlaps to the two sides of the device, leaving just enough space on the top and bottom parts.

The mock up, however, is silent on how actually the handset will behave and what are the exact new offerings will it bring to the table.

Thankfully, hints from published patents and blog reports are aplenty, which picture the 5S successor as an A8-powered device with 64-bit computing standard and its screen rendering fired up by a quad-core GPU.

One possible unique offering is the inclusion of control keys that fade out when not in use as pointed out by one patent filing attributed to Apple.

Yet more likely, the next iPhone is stuffed with killer features, courtesy of course by the Jony Ive-redesigned iOS 7.

So far, Apple has been very silent when it comes to specifics about the iPhone 6 though it is widely believed that release date of the smartphone will happen in the first half of 2014.