In order
1. NOT a bigger phone or screen. Smaller phone or screen please
2. More comfortable to hold; the 4 and original iPhone were very comfortable. 5 is not. The edges are too hard, it is uncomfortable slide, and the metal is more slippery than the glass back was.
3. Longer battery life
4. 128gb option would be awesome; would negate having to use iTunes match and streaming in unreliable areas
5. Touch ID SDK
6. Improved camera, as always.
7. Ability to resize custom wallpapers
8. Improving iOS color scheme etc so it is less bright/quick moving
If they do a notification light, it should be a pulsing border, home button, or apple logo
I don't know why everyone "needs" a bigger screen (and yes, there are multiple references to how the iPhone 6 "has to have", "needs" or will be "dead" without it). Its made it this far. Thats the LAST thing I want on my phone. I am considering going back to the 4 or sticking with the 5s, depending on if they release a touch SDK.