YouTube gaming channel UpUpDownDown has revealed the next character for Injustice 2, and it is Firestorm. They did not specify if it is the character Ronnie or a the combination of Ronnie and Martin Stein.
The reveal video starts with an Ed Boon interview and then switches to the UpUpDownDown guys playing as Firestorm and Doctor Fate. The YouTube channel is run by Austin Creed aka WWE Superstar Xavier Woods, so you see him going up against one of his New Day rage team partners Kofi Kingston.
Reveal starts at the 5:33 mark:
Injustice 2 is due out May 16, 2017.