The weapons should come from previous bosses and the better armor/accessory upgrades should drop from Twintania to make clearing Twintania slightly easier. The content they have planned next must be really hard if the items that make killing the boss easier drop from the boss. It's the same logic as Diablo 3 launch before they nerfed Inferno. Need the items from Inferno act 3 to beat Inferno act 2? Better get better at the game!