It makes me think what would I actually want to improve on the iPhone if I could. So when it comes out (and I don't think it will be called the iPhone 5) I hope for these simple upgrades.
1. Larger screen
2. A little thinner
3. Siri actually works
Other than these simple things, I am scratching my head as to what ground breaking additions can be added to the iPhone. I mean, it was the iPhone's simplicity that was it's beauty. So to clog it with more so called "features" won't necessarily add to its appeal.