In EA, there's a sentient amulet we can find in Grymforge, so I wouldn't rule out sentient weapons in the game. As has been said, there's precedent in the Realms and in BG2 with
Lilarcor.
Though like rodeolifant I'm trying to avoid as much info as I can about Orin as I think the more of a surprise she is the better and I already feel I know too much, so am not watching that vid and can't comment on whether her weapons are likely to be such items.
