This is certainly interesting. What I'm most curious about is how iOS will scale. I desperately hope Apple will finally consider doing more with the home-screen than adding more app icons or scaling the size of them. It could be so much more... alive.
As long as width stays the same. I think Apple is the only company out there that has been sane enough to keep their phone usable with one hand. With the current size, I'm already having trouble hitting the back button.