The trailer does also show Scarecrow unleashing his gas and controlling minds, so it’s possible that the Riddler is being forced to attack Lee.
Of course, the whole three-minute trailer isn’t just reference after reference to the Joker.
The Legion is apparently comprised of at least Penguin, Scarecrow, Firefly, and Victor Fries.
Riddler isn’t seen at the mandatory brunch meeting, but a shot of him seemingly attacking Lee points toward him joining his pal Penguin and the rest of the baddies on Jerome’s mad mission.
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Jerome 'White Band' Trailer 2018 | Season 4 | GOTHAM