Russian site AppleInsider.ru just posted a mockup of the device, featuring a larger 4.2-inch screen.
The change is especially visible in width than in height.
The dimensions of the concept are 108.5mm x 55.7mm x 7.1mm and the smartphone weighs 104 grams.
Another notable feature of this concept is the disappearance of the physical Home button.
Discover the new iPhone 6 concept in photos and the video below.