You forgot the most important improvement, significantly improved battery life and I mean significantly. That trumps pretty much everything on your list, including that hologram projector one.
I agree. Battery is the one easy piece of low hanging fruit. Apple could offer a device slightly thicker with signficantly more batter life and people would go nuts about it. Either that or they need to find some realistic way to deal with the battery issue.
I know some asshat will say that it's just me and that they easily make it through their day with 40% on their 6/6s. But most people I know have a charger in their car and at the office. People carry portable chargers. They run for the airport outlets just like in the Samsung commercial. A device that had truly improved battery life would be very popular.