What's happening is they're hoping against hope that their shipment will still make it on time to make the cards legal. It's still on the boat 3 weeks away as of today. Assuming that it goes to shipping next week, most stores wouldn't see it at a minimum of the week of the 26th, at least with my FFG shipping experience in Michigan. I dunno how this goes for non-US people.
At this point, they should know if they think that's an acceptable amount of time to allow D&D or not. Even if they sold copies at HQ, is that really fair to all players? It's not like Old Hollywood/Universe of Tomorrow (or D&D) was legal for US Nationals.
With how important their World Championships are supposed to be, you'd think they would take them more seriously for their customers.