I can't imagine there not being. I guess we'll find out tomorrow.
I like your optimism, but I'm pretty sure they would have mentioned it in the blog post if there would be double gold again. Seems the new rewards from the tavern brawls and legendary quests replaces double gold. Personally, I don't mind missing out on the extra gold in exchange for a more engaging and fun fire festival, but then I'm not F2P so I won't miss the gold as much as many others.