Yes, Nokia 7 Plus does have the hybrid sim slot. You can use either 2 sim cards or 1 sim card & 1 memory card.
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.
No. Nokia 7 Plus does not have the notification light. But it does have the ambient display, so you will always get alert on the display.
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.