Yes, LG has already announced that Android P update is already in development.
Yes, LG has added voice recognition in LG G7 Plus. This is actually a combination of a new chipset, a few mics and Google's AI. The G7 Plus can recognize your voice from up to 5 meters distance even in a noisy of surrounding and can launch Google Assitant in an instant.
Yes, LG G7 does have the portrait mode.
Yes, LG G7 does have the gorilla glass protection at both sides of the phone, front & rear.
There are so many little things done right in the G7, but it's up to you to discover them as our review is about to end. If you can live with the small setbacks the still camera has, then you most definitely have to try the G7 for a size.