At the bottom, there are two more holes on one grill than on the other, due to the headphone jack. This lack of symmetry is jarring on an Apple device. It looks unbalanced. Jobs would fix that by removing the two extra holes.
I don't care for the two-texture back either, or 16:9. I would vastly prefer a slightly larger display with the same pixel count, say 3.8" or 3.9", and the current 3:2 ratio, in a marginally wider, but not taller, handset. I think it would be more comfortable all around. The portrait mode keyboard was always slightly too narrow. I feel the 16:9 display is a quick-fix cave-in to Android phones with huge screens. They wanted the display size to start with a 4. The only upside to the 16:9 display is for videos, and that's not a huge benefit, really.
The connector change is fine if an adapter is included free of charge (or very cheap), with no loss of functionality. If not, then it's a show stopper.
The dark color, looks bluish, is odd. The color itself is OK but by being dark it doesn't look as distinctive as the current design. Most handsets are dark.