I'm not sure something higher than 4K is useful now. You reach a limit and then there is no point going beyond i.e., Apple will 'never' resolution beyond retina as that's beyond what the human eye can discern anyways. I'm not sure about TVs and cameras though, maybe a bit better than 4K, but NOT much better. Yes I know, some vendors came up with 5K, but I think at this stage it's more of a marketing gimmick ...
What I would REALLY like to have in the phantom, is the option of a camera zoom. Now that might be heavy/expensive, but to me it is the next logical 'evolution'. And no, digital zoom (as Sony calls it) is just another piece of useless cr*p.
I personally have no care or use for anything above 4K, but that was put out there for those who do care.
My big request is for a more compact design(folding), a far more robust design(no cracking of the airframe from regular flying, let alone while not crashing, hard landing or tipping over), limiting of props and prop shadows in the frame, and longer flight time(30 minutes is a good target).
I have zero care for retractable landing gear and a rotating gimbal, but if it does and it is a good robust design, I will have no problem with it. Light rain resistance would be a plus, but water proofing would not push my buttons.
I'm big on optical avoidance, but if sonar and/or infrared is better, use them, and have whichever added for ascension, since all other sides are covered.
Zoom doesn't push my buttons, but for those of you desiring it, I don't see it as a negative. A changeable camera - I do see as a must since the Phantom line is used so much for public service and commercial use.
Lastly, a good strong signal. I know that varies due to various conditions and markets.