Several iPhone 6 prototypes appear to be floating around. The model with a 4.8" screen is the most interesting. It has a Retina+ IGZO screen, a new A7 quad-core processor variant, and a new form factor with no home button. Full gesture control is also possibly included.
The idea of Apple dropping the home button has been rumored in the past but hasn't materialized. Although, Apple has added gesture controls to the iPad.
Misek also predicted the iPhone 5S would be released in June 2013.