Yeah, that interview definitely sets a good background for the story development in BG3. And I think it may even go back farther in the BG series ... I always wondered what "The Hidden" was all about after finishing BG2.
In fact, after seeing Ed's video link here, it certainly appears quite possible that BG3 actually is the continuing story of The Hidden. That would make a lot of sense, and what a wonderful way to add another connection!