How about the iPhone Ultra?
There's been a lot of rumors about bigger iPhones like 4,7 inches to 5,7 inches, passing by 5 inches, and I think if Apple continues with the 4 inch iPhone and launches an bigger iPhone with a Retina Full HD 5 inches screen it would be an extremely sucessfull smartphone.
I think that big iPhone would be launched in September and be like that:
Name: iPhone Ultra
Software: iOS 7
Design: Just a scalled up iPhone 5, with the same margins but only 7 mm thickness, and possibly most resistant materials
Weight: 108 grams
Screen: Retina Full HD screen
Processor: 2,4 gigahertz A7X
3 gigabytes of ram
100 $ more expensive than the iPhone 5S
So would you buy one of those?