I want Apple to include something no one thought of. That is usually the best kind of new product, not just iterations where battery life improves (a no-duh improve,met) or aesthetic changes such as no or reduced antenna lines or flush camera lense. Same thing goes for screen improvements. Maybe OLED will be an improvement, but not if it negatively effects battery life or the UX of iOS, thank you very much.
These things are all expected and things Apple no doubt is working to improve all the time.
Imagine how everyone would feel if all we got were minor improvements to existing tech? That's boring. And although there is no lack of armchair quarterbacking going on in these forums with people who think they know best what we all want / need, my experience in designing and selling products is that the customer generally only wants what they already know and live with.
Just look at the vitriol tossed out regarding the 3.5mm headphone jack as a perfect example, or how people complain about Bluetooth sound quality, when they haven't heard or used any of the recent crop of great sounding BT headphones on the market.
I love it when Apple makes drastic shifts with products and forces change upon the masses, because it's only then that we move forward in meaningful ways.