No. Nokia 7 Plus does not support face unlock as of now. It is expected that Nokia will soon release an OTA update for it.
Yes, Nokia 7 Plus does have the dual VoLTE support.
Yes, Nokia 7 Plus is made of series 6000 Aluminium.
Yes, Nokia 7 Plus does have the OTG support.
Great battery life, immersive display, solid design, and software at its purest, that's the Nokia 7 Plus for you.