Its not an upgrade option for P2 owners.
Mainly because -
You can use the P2 transmitter with the P3.
You cant use the P2 batteries with the P3.
And I doubt that the V+ gimbal and camera will be fully compatible.
I'm struggling as a P2V+ owner to understand why anyone would even consider this offer. If it had been part exchange your old to get a new then maybe it would be worth it.......
Off to look for forum comments about a certain singer minus a couple of finger ends..........