Why would you get a prize just for already having Thunderlord? You could always treat yourself to one of the Eververse exclusive skins for the Thunderlord. You can even help some Guardians get the Thunderlord too while you're trying out all the new tweaks to the subclasses mentioned in the TWAB. I know I'll be grinding for the new Catalysts and I'm super excited for seeing how I can maximize the full potential of the new subclass buffs!