Apple (NASDAQ: AAPL) is about to release its iPhone 6 and iPhone 5S soon, according to new rumors.

There is an undying rumour tech giant Apple will release the next generation of iPhone this month at the imminent WorldWide Developers' Conference hosted by the company annually.

The unannounced iPhone 6 and iPhone 5S are clouded by a myriad of rumours. A lot of concept renders are emerging on the internet as the devices' release date nears.

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.

It is initially reported that the new iPhones will be launched in June along with the upgraded iOS. However, other reports stated that the devices will make its debut in September.

The Apple chief Tim 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.

Below are the five reasons why Apple will release the upcoming iPhone 6 and iPhone 5S this month.

iPhone 5 Trade-Ins - The traditional trade-ins of previous models of iPhone already started. Best Buy is working overtime to rid itself of its iPhone 5 inventory, in the best hint yet that the iPhone 6 release date is drawing near.

iPhone 5 Discounts - There are some retailers and stores offered discounts on the latest iPhone 5. Best Buy offered $50 less for iPhone 5.

Analysts' Statements - Many analysts expressed that the iPhone 6 and iPhone 5S will be released in June. Some of them think that Apple will announce the new iPhones at the WWDC event. If not, the company will give a hint on the features of the handsets.

Apple Renewed Product Cycle - Apple announced before that it will implement a new product cycle of its products. This is already seen with the company's tablet iPad.

To Keep Up With Rivals - Rival company Samsung already unveiled one of its flagship phone this year and is already eating up the market. Apple will lose some of its consumers if it will release its next smartphones a little too late because the latest smartphone from Samsung boasts great specs and features.

To Appease Investors - Due to the slip on the earnings of the company, investors may be pressuring apple to release a new device in the next months. It was reported last month that Apple's earnings went down, which is unusual for the tech giant. The next iPhone is expected to save Apple from shame and put it up on the pedestal again.