3. Chasing Down Calender Man
He featured in Arkham City, locked in a clear cell under the court house, if you visited him on certain days of the year he would tell you a murderous story in relation to that date. If you speak to him about all 12 days and come back you will find a hanged goon in his place. This is a scarier and more interesting version of the second rate character that Calendar Man usually is (he is featured in The Long Halloween storyline as a Hannibal Lecter style maniac who Batman asks for help) so considering in the game he is darker than his comic book counterpart and also taking into account the game takes place on Christmas Eve, this means the Calendar Man could be gearing up for a big crime. Batman could be tracking him through the city as he comes closer to Christmas Day finding out more about who the man is and what he intends to do. It could be similar to the Hush side missions in Arkham City which were eerie and would be nice to see the Calendar Man as something more than a joke again.