Still have the M3P of course. The big things I am looking at are:
1. Being able to flip to vertical on all cameras and having the controller do the same with the screen.
2. Reported increase in dynamic range.
3. Longer flight time, less batteries to carry.
4. Higher max speed in Sport, getting to and back from subject matter faster leaving more time on the subject.
5. Possibly sharper images even at 25MP standard, DJI knows this is important.
6. I have an Autel EVO II Enterprise and prefer its 28mm lens over the 24mm on the Mavic 3 Pro so the slightly longer lens on the M4P is a win for me.
What I *hope* I can easily do is program or at least easily sequence stitched shots using the two longer cameras to in order to arrive at natively larger file sizes for fine art output, but this is entirely dependent on the operational feature set of the bird / controller. I do this by hand on the M3P and they come out simply amazing on landscape type shots, 60-80MP native res not uncommon. If DJI can create options of 3x3, 4x4, 4x5, 5x6, etc panels and not just horizontal panos with this new bird, I will have a much improved aerial machine for Fine Art.
One can hope anyway...