User blog comment:Jimeee/Hearthfire confirmed as the latest add-on. Official trailer./@comment-4976111-20120907191550/@comment-5280592-20120909044152

He's either being the Joker(Not likely =D), or the original Batman, who only did things for shits and giggles the frist few issues. I must go cite where I read that, though Google hates my guts for some reason.