Given the Neverwinter book, most likely a Neverwinter Nights MMO. Doubtful it would be BG3. Would be better IMO if it were set in the PoL world, but that's a pipe dream.
I tend to think you're right about it being NWN-related too. PoLand is too 4e-related and the FR novels at least have a large following outside D&D; they'll want to attract those people to the game, is my guess.