You may want to check instagram or Facebook to see what sellers are doing pickups. I think it's safe to say that the castle and logo beads will both be there when you go next year, since the castle pins for both WDW and DLR have been there since the beginning. As for the grand opening pins, you may have a bit of a harder time tracking them down. But if you're' vigilant, I'm sure that one will pop up on the Bay soon enough. Good luck!