Since it has the A9 processor etc, You can w/o any doubt use it for flying with any App of your choice.
The only aspect is the size - the new iPad is the same size as the first gen. iPad Air (so - a small bit thicker than
Air 2 or 9,7" iPad pro, but thats OK) - it fits barely in P3A/P remote holder - if you put any cover on ipad, it will be too big.
Since I don't consider to use my iPad pro (9,7) without case/cover, i bought an extension adapter (3D printed, quite cheap).
Another upgrade I did - I hate the plastic mounting arm on P3A RC - when i put in my iPad, it becomes a bit wobbly. So, I upgraded the mount part with cnc-machined aluminium one :
Junsi Silver CNC Mount Display Bildschirmanzeige Holder: Amazon.de: Elektronik
Btw, the Inspire RC has aluminum leg, and You can buy it from DJI.
I opted for 3rd party leg due the large flat front part, which adds more rigidity.
Dont get wrong - the original holds too, but the aluminum feels far better.