Yes, Vivo Y83 does have the face unlock.
Vivo Y83 comes with 5V / 2A charger and it helps the phone to charge quickly.
Yes, Vivo Y83 does have the 2.5D Corning Gorilla Glass display.
There is no official announcement from the company if Vivo Y83 will support 5G network in future or not. But looking at the technical side of the phone specifications, we think that Vivo Y83 will support 5G network in future.