A Flickr user named Martin Hajek has came up with a set of 3D models of what could be Apple’s upcoming next-generation iPhone. These renders were apparently good enough that some publications posted these images, assuming they were leaked promotional pictures from Apple.

Hajek used Rhinoceros 3D to create the model based on leaked images of the upcoming smartphone’s components, including the most recent – the iPhone 5’s alleged back plate.

The most immediately obvious characteristic hinted at by the new back plate is its increased length over its predecessor. This component is apparently made out of aluminum, with strips of glass on the top and bottom. At the same time, the images showed a number of other rumored features, including a thinner design, smaller dock connector and new speaker grills.

Apple’s next-generation iPhone could also include an integrated antenna band in the handset’s unibody. Significantly, the apparently stretched design of the mobile also suggests that the iPhone 5 could have a larger screen, which is rumored to be 4-inches in size.

Rumors indicate that Apple’s next-generation iPhone could be released this fall, possibly in September or October. The revelation of iOS 6’s feature set also shows what potential buyers of the latest iPhone could expect when it hits the market. Apple claims over 200 improvements to its mobile operating system, including enhancements to Siri, an Apple-specific mapping service and a host of performance advances over its predecessor.

It’s almost certain that iOS 6 will get introduced in the next-generation iPhone, and the render offers a tantalizing glimpse at how the much-awaited device could look like.