If you have gotten the advanced, then you are more likely to be in the green. I cant find the link but the HD and 4K cameras are swappable. The benefit is only realised if you damage your gimbal+camera. So if you own an advance and have an accident, your "upgrade" to 4K will be cheaper as you did not pay the initial cost of $1299.
According to the link..
http://www.phantompilots.com/thread...attery-backpack-cameras-chargers-props.40590/
4K Replacement Camera - $539
HD Replacement Camera - $450
An advance user who damages their camera will fork out 1000+539 = 1539 to get 4K
A Pro user who damages their camera will fork out 1300+539 = 1839 to get back on their feet (or in the air).
You've saved yourself $300 and you now have 4K.
But for everyone's sake!!! please look after the gimbal and camera. Its the Achilles heel of the P2VP and P3.
Its DJI's CASH COW!!!
On a side note...
When I look at the difference the standalone camera price, I now think that DJI was meant to ship the Pro with the hardcase. They retracted because they saw the demand took the opportunistic money grabbing approach.