It what is sure to drive traffic for many Apple rumor blogs today is a new high quality leaked screen shot of what is reportedly from a prototype future iPhone running iOS 8.
Since I'm still on year one of my two year Sprint contract, I'm trying not to get dragged into the hysteria the comes just before a new iPhone launch. (And as my Dad will tell you, I keep all of my old phones, so the cost of upgrading for me is will over $700 USD.)
Still, I'm sitting here at my desk trying to imagine how much larger a future iPhone would be from my current iPhone 5S. I'm not so concerned about height, but in terms of length and width.
My guess would be that the forehead and chin of the iPhone 5/iPhone 5S design will shrink slightly to squeeze in another row of icons; growing the icon grid to a hight of 7 from current 6. As for the width, I can see Apple increasing the total width of the iPhone and shrinking the side bezels slightly to get the extra 0.5" to get an extra column of icons on the display; effectively growing to 5 columns from 4.
I think which ever way Apple decides to grow the iPhone, it is going to be a hit. As more and more time goes by, I seem to be in the minority about popular phone sizes. I'm perfectly happy with the size of my iPhone 5S. Using one hand, I have just enough clearance with my thumb to reach the top of the screen and still hold the phone securely in my hand.
It's becoming pretty clear, that for many people around the world, the iPhone is the only computer they are going to ever own or want to use. And for that to work better, screen sizes need to grow from their current sizes.