A fresh round of rumours emerged this week about the speculated specs and features of the upcoming Apple smartphones dubbed as iPhone 6 and iPhone 5S.

Rumour has it that the iPhone 6 and iPhone 5S will include some amazing features that will wow critics, reviewers and consumers.

Rumour has it that the next iPhone will feature Retina or IGZO screen display, A7 quad core chip processor, iOS 7, 128GB internal storage, 13 mega-pixel camera, and longer battery life. The lack of NFC support on the iPhone 5 was one of the biggest criticisms aimed at Apple's smartphone.

Meanwhile, the cheaper iPhone 5S is rumoured to sport a plastic casing, 4-inch screen display, dual core processor and 8-megapixel camera.

The Apple chief Time Cook also dropped several hints that the upcoming iPhone 6 and 5S will be released later this year. Cook said that no new products are to launch before the end of the year.

Cook also subtly dented rumours that the iPhone 5S could launch as early as June. "Our teams are hard at work on some amazing new hardware, software, and services that we can't wait to introduce this fall and throughout 2014."

It seems that the reports on the delayed release date of Apple products proved to be true. A number of analysts claimed that Apple's smartphones are delayed due to "production issues".

However, Apple did not give an official statement on the rumours surrounding iPhone 6 and iPhone 5S.

Below are some of the new rumoured features of the Apple smartphones.

Larger Screen Display - New rumours claimed that the iPhone 6 set to be released in June 2014 will feature a better front and rear camera. However, Apple CEO Tim Cook initially denied that Apple will increase the screen size of its flagship smartphone. In the most recent earnings call with investors, press and analysts, he subtly confirm that Apple will retain the size of iPhone's screen.

Better Front and Back Camera - New rumours claimed that the next generation of Apple's iPhone will feature an improved front and back camera. According to the latest gossip, it will feature an improved 2 megapixel front-facing camera and a 13MP rear camera.

The report comes from iOSDoc and says the next iPhone will come out with iOS 7 on board and the smartphone will have the ability to record full HD videos. Furthermore, the latest version of iOS, which is yet to be announced, will have a new feature called dual-shot, which is quite similar to the dual-camera mode on the LG Optimus G Pro and Samsung Galaxy S4.

iOS 7 Upgrades - Reports claimed that one of the causes of delay of the next iPhone is the meticulous upgrades in the next version of iOS. It is speculated that the iOS will backed some of the amazing features of the upcoming smartphones such as the improved camera.

4GB RAM - A recent report stated that the next iPhone will include a 4GB RAM from rival company Samsung. Patently Apple claimed that Samsung started the mass production of 20 Nano class DDR3 mobile RAM. If rumours proved to be true, the iPhone 6 will be so powerful that it can easily compete with PCs in handling data.

Bendable Battery - Rumours claimed that Apple is planning to produce a bendable battery, which could mean that future iOS devices could have the much rumoured flexible display.