New 'Gotham' Season 2 Promos Promise the 'Rise of the Villains'

In the city of Gotham a new era has begun. GOTHAM season 2 premieres SEP 21 on FOX!
Fox released new promos for season 2 of Gotham and one of them promises the 'Rise of the Villains.' Notably one of them sees the return of Jerome (Cameron Monaghan) who last season was accused of killing his own mother. It's been rumored that he's the young Joker of the Batman prequel drama, but there's been no official confirmation.