Well, to be fair they announced it like 2 days before it's release. Anyone would expect Halloween to expand on the story because that's what the GW franchise did every single year. Of course this is a major let down for anyone who cares regardless whether it was announced 2 days before or not. I for one had planned to log into GW2 for the Halloween story. Because even if I don't care for GW2 anymore, since I have given up on it to be the game I wanted it to be, I still care for the GW lore and am excited if I can learn something new. Well, this plan was shred to pieces.
If this was Wintersday, Dragon Bash or the like that would be a completly different story btw.