Yes, You will get Moto Style mod free in the box.
You do not have to do anything special to avail Jio offer on Moto Z2 Play. Just when you start using the mobile, insert your Jio sim and it will get activated by the Jio company itself.
Yes, it does support 4k Videos shooting as well playback.
Yes, Moto Z2 Play does have fingerprint sensor.
Moto Z2 Play has protection against water. It comes with water repellent nano-coating.