Apple's much-anticipated smartphones - the premium iPhone 5S and the other a cheaper plastic variant called iPhone 5C, will hit stores in a little over a month, according to a new report.

German blog iFun citing a "very credible and serious source" has revealed that the American technology major would release the next-generation iPhone 5S as well as the low-cost iPhone 5C on 6 September, hinting that the new devices may be unveiled in August.

Along with the two iPhone variants, the Apple event is also expected to witness the launch of the new generation iPad (normal), said the website.

The revelations come at a time when Apple's manufacturing contractor Foxconn is said to have chalked out plans to increase its workforce by hiring 90,000 more workers to streamline iPhone 5S production to satiate large orders.

Apple's other chinese partner, Pegatron, which is said to have bagged the contract to manufacture iPhone 5C has reportedly hired an additional 40,000 workers to its current 100,000 plus workforce.

Looking back at Apple's history of launch patterns, the company has always released new smartphones annually since the launch of the first iPhone model in 2007. Taking note of the recent developments, many believe that Apple might launch new iPhones this September as its current model, iPhone 5, was unveiled around the same time last year (12 September to be precise).

Rumoured specifications of Apple's premium iPhone 5S and Low-cost 'iPhone 5C':

Model Apple iPhone 5S Apple iPhone 5C
Display 4.0-inch screen with IGZO display technology 3.5-inch screen 
OS iOS 7 iOS 7
Processor Next generation Apple A7 Chipset with four-cores A5 chipset
Camera 13.0-megapixel camera with Dual-LED flash support for enhanced low-light image capture 5.0-megapixel camera
Add-ons Finger-print scanning system to unlock screen, improved voice-search feature Siri, NFC 3.5 mm audio port, lightning port, plastic/polycarbonate body case