I want a headphone jack. 
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Agreed with everything said here. They could move the sponsor to the back of the device as LG has done, though I expect we would first see pigs fly lol. Sensor on back is actually a wonderfully ergonomic move, though I admit it detracts from the overall look/beauty of the device.I might be in the minority here, but I'm actually happy with the battery life on the 6S plus, I get through a whole day and still have about 25-30% left when I go to bed at night around 11 or so. And that includes having bluetooth on all day for the apple watch and my jaybird X2 headphones. I also watch movies on my commute both ways.
If I had to pick one thing for the iPhone 7 plus it would be reduced bezels in order to reduce the overall footprint of the phone while keeping the same screen size.... But as others have pointed out this will be challenging as Apple has hitched their wagon to touch id for the next few years at least, unless they figure out a way to make the sensor much smaller and still function the same.... I don't see that happening in the next few iterations though.