Same height and weight as Firefly's profile in Arkham Asylum, the mentioning of chemical reagents, under scars it mentions intensive damage to his body, and you can see the phrase "Lynns is equipped with" near the picture.
I think it's safe to say that this is Garfield Lynns.
http://www.youtube.com/watch?v=RMnhk26J1bM (Proof that Superman and Sephiroth are one and the same.)
Well the hints/clues pretty much confirm that is firefly. Now I'm really have some concerns about this boss fight and how the developers are able to combine the abilities to fly and flamethrower against a young batman.
Joker is clearly getting a much bigger part in the grand scheme of things. Almost to the point like the trailer was claiming him to be one of the assassin's. I say that because he would show up around the same time they where talking about the known assassin's already. I don't mind him in the game, I just don't want him as an assassin.
The trailer itself was awesome. Happy to see a lot of new stuff. Demasked Deathstroke, yes. Firefly looks awesome, although his fight has me worried. It's either going to be awesome or incredibly bad like Killer Croc in Asylum.
Also Bane breaking the Bat back.
Full Sail Game Design Student Games I Want: Kingdom Hearts HD 1.5 ReMix, Killer Is Dead, LocoCycle, Batman: Arkham Origins, Pokemon X/Y