I really hope they never reveal the Joker in this series. The whole point of the Joker is the be the nemesis of Batman - so he can only be around when Batman comes to Gotham. You cannot have one without the other. Maybe when this series ends and Batman takes the stage does the Joker get revealed.

I'm a big fan of Sherlock, and Doctor Who. Both run by Moffatt. Both have the same problem. Each story is so Doctor/Sherlock focused that the entire universe in which they operate suffers as a result.