Two new iPhone 6 concepts have emerged online boasting more than 4-inch screen display.

Designer Alex Casabo created a render of iPhone 6 packing a 4.7-inch screen panel. The concept image showed off a full HD 4.7-inch screen with Gorilla Glass 3 protection. There's an Apple quadcore 1.2 GHz A8 processor inside, 1,930 mAh battery and iOS 7.2 on board. Fingerprint sensor is retained but with increased efficiency, the phone has a thickness of 5.5 mm.

The device weighs 109 grams and has 600 dpi fingerprint scanner. The volume buttons are now pill shaped and iOS 7.2 comes with features like password/touch ID for accessing apps and can close all multitasking apps at once. The handset comes in space gray, white/silver and gold and relies on a PowerVR G6630 CPU.

Another iPhone 6 concept image making the rounds online is courtesy of Mustafa Dagdelen and Ran Avni. The creators named the render as iPhone Pro , which is rumored as Apple's upcoming phablet.

The device has 4.9-inch full HD device with 0.5 mm frame thickness. The power button is placed on the right side. The body is built from aluminum and measures 6.8 mm in thickness. Rumors claimed the iPhone phablet will have a 20 nanometer processor made by TSMC and will pack a stylus.

Meanwhile, rumors suggested iPhone 6 will be powered by A8 processor and will run with iOS 8. It is most likely that iPhone 5S' fingerprint sensor will be retained but will be packed with new capabilities. Moreover, Apple patents found suggest possible specifications that consumers can expect such as a curved or flexible screen embedded by durable material called liquidmetal and reinforced by Sapphire glass covering, an improved Siri and gestures control. Apple has not confirmed yet whether these are real iPhone 6 features.

As for the release date, iPhone 6 is bound to arrive in late summer the earliest. Other reports claimed the smartphone will be launched in September.