If P5 does have swap-able lenses and that's all, I'm not sure it will sell very well. Professionals may like it, and can afford it, but I would expect the masses with P4Ps already will hesitate. The improved camera will likely push the selling price closer to $1800, maybe $2000. Add batteries and your at $2500. I will be disappointed if the P5 doesn't include:
1. Sinusoidal ESCs for better battery efficiency (like Mavic Platinum)
2. Quieter props (like Mavic Platinum)
3. 360 rotating camera and retracts (as shown by Autel at CES in their 350mm craft)
4. 99W battery, adding a little more battery power than
P4P, but still legal to carry-on as many batteries as you want on a plane.
5. Offline mode, guaranteeing no data is collected by DJI (they offer this in their high end drones today).
6. A gimbal that doesn't flip during wind or high speed flying
7. Ocu-Sync communications, so multiple display receivers can independently see the FPV view (like Mavic), via wireless.
8. Carbon fiber shell, so the cracks go away.
Frankly I would be happy with the current
P4P camera and buy a P5 if it had the above 8 features in my "wish list".