Why did Sven say "on the very first day ", twice...i think you're on to something. Perhaps it's two worlds like Faerun\Shadowfell well be visiting them both. or a tie in to BG1&2...
The game already shows the Shadowfell in the intro cinematic and there already confirmed tie-ins to the previous games.
Saying something twice isn’t a secret code. It’s just Swen being excited and emphasizing how early people were speculating about the thing he wants to talk about and can’t.