Yes, Moto Z2 Play 64GB comes with latest 7.1 Android OS so you may not require to update it immediately but going forward, company will produce OTA updates.
Yes, Moto Z2 Play comes with the inbuilt battery.
Yes, finger lock is available.
Yes, Moto Z2 Play does have VoLTE support, also.
Yes, it does support 4k Videos shooting as well playback.