I'd like to see the apple logo on the back illuminate in call etc like my MBPro. Otherwise the ip4 is rolling fine for me. Bring on iOS 5
I thought the same thing at first, but then thinking about it more it doesn't make sense. The light would come from the screen, and that shuts off when you're talking on the phone anyway, and when the screen is on, the Apple logo would be facing the ground if you're just holding it in your hand.
Plus there's all that electronic stuff blocking a "hole" in there unlike in a MBP it's just the screen (no battery, logic board, memory)