I truly didn't think I'd ever get those pieces. I bought the expansion over a year ago, and put in the request almost as far back as that. Anyway, for those who have at some point put in a request, hold on to hope!!!
So it seems they waited for enough request, and then answering them all at the same time
From all the info that I've heard/read what probably happened was WK had ordered replacement reprints around the same time as when they put in the order to reprint the board game and all of its expansions. The board games/expansions are expected to hit retail sometime late summer, which fits pretty well with the current state of things. The fact that many people seem to be getting shipping notices now is more than likely not coincidence.