What things would add BG flavor for you in this game?
Familiar sounds (small things, like the sound when you open chest or shoot a bow or click on menu item), music, familiar chants for each spell school.
Familiar icons - especially for common things like leather armor, longsword, shortbow etc.
Familiar location design - in cinematic we can see inside of mindflayer ship and it looks very similar to what we saw in mind flayer dungeons.
It's a question of what looks/sounds better. Things from BG2 won't look familiar to most people who play this game, because they either never played BG2 or haven't returned to it since they played it. So long as quality isn't being sacrificed for familiarity, then sure, make things familiar.
What does this mean?