Original Phantom, as we all know, uses 2.4 Ghz for control and 5.8 Ghz for FPV.
The Vision is said to swap those frequencies, using 5.8 Ghz for control. That does open things up to some possible issues, while perhaps severely limiting options to resolve those issues.
Consider as radio frequency increases, the more the radiated signal behaves like a flashlight beam. The signal will also be more affected by trees, and foliage and have less penetration.
Since 2.4 Ghz is in wide use for RC controllers, and 5.8 Ghz for wireless video, there are lots of aftermarket equipment options . . . not so when you reverse the frequencies.
I understand why DJI decided to go this way, as two way WiFi control of the Vision using a smartphone, going through a booster (repeater) is appealing. However, smartphone displays do not generally work well in bright sunlight. It's all about the brightness (or lack thereof) of the display as that's directly affected by the power available to backlight the display brightly. On cell phones this is limited by battery size and the need for decent battery life.
The Phantom Vision may well be a winner in terms of off-the-shelf, ready to fly appeal. Though I'm betting this will be mostly to the newbie who isn't aware of or considering the inherent limitations. At least with the original Phantom there are lots of options.
bumper