Nomura analysts said iPhone 6 features may include 20 nm chip processors with 64-bit architecture.

Analyst Anne Lee and her team said iPhone 6 will have a 64-bit 20 nm processor. Adding 20 nm processor will keep Apple ahead of its rivals in the market.

The current iPhone 5S packs an A7 28 nm processor. The smaller the number, the more capacitors can be packed in the chip. This delivers more powerful performance.

The analysts also cited its "industry analysis and supply chain survey" saying that iPhone 6 will pack 4.7 inches and 5.5 inches screen display.

Nomura analysts believe that the key deciding factor for how large the iPhone 6 screen will depend on how well in-cell technology can be scaled up to a larger size. They added Apple is having touch panel manufacturers send samples for testing.

Nomura analysts also asserted that the iPhone 6 will be released in the third quarter of 2014, which would be the June in Apple's calendar. However, previous reports claimed that Apple will unveil the smartphone in March next year.

iPhone 6 release date may not happen anytime soon. According to a report from Wall Street Journal, Apple is adding more suppliers to increase the availability of iPhone 5S due to its strong demand. Companies Wistron and Compal will join the existing Apple suppliers, Foxconn and Pegatron. The two companies will work in the production of iPhone 5C and iPad Mini with Retina display so that Foxconn can focus solely in manufacturing the iPhone 5S. Manufacturing the iPhone 5S takes longer due to the inclusion of fingerprint sensor.

According to the latest rumors, iPhone 6 features will use a Sapphire glass for its screen display. Apple already used the technology in the cover of iPhone 5S and Touch ID home button. The Sapphire glass will battle the Corning Gorilla Glass used in iPhone's rivals.

Apple recently signed a $578 million deal to open a plant in Arizona with GT Advanced Technologies. The latter will be in charge with the inclusion of the rumored Sapphire glass in the handset.