that's what we're supposed to work on. Money was the first hint. The fact that all the cities are Fed Reserves are two. Step three... hmm.
We're not going to be actually at a bank or a reserve bank. But we could be "online" at a bank, the Gotham National Bank is a good idea for our participation after those in the cities do their part.
Bank robberies are now supposedly done online, and the Joker knows this. So he's probably got a plan to simultaneously rob all 12 cities at once through maybe Gotham's National Bank system. If everything points at money, I'm thinking a robbery of codes and stuff to break each city's system, you log into the bank online, and hack hack hack.
Question is, we haven't seen an update from GNB recently, but we do know of
http://www.gpdmcu.com/images/network.jpg which means gpdmcu will release some sort of network link of organized crime, and maybe a clue to how the last game and this game will work together.