Right, Black Mask. I thought it was hinted that he's in the game though, because of the Sionis sign that's been shown several times. I hope it's not just an easter egg and he does appear.
I'm still upset that there's no sign of Scarecrow, and the more villains they reveal, the less likely I'll get my favorite. Mad Hatter is definitely a nice addition! I was not expecting that.
Joker (Awesome)
Harley Quinn (Awesome)
Penguin (Awesome)
Solomon Grundy (Not a fan, but it'll still be cool)
Mad Hatter (Awesome)
Talia al Ghul (Awesome)
Catwoman (not really a villain)
Mr. Freeze (Awesome)
The Riddler (Awesome)
Poison Ivy (Awesome)
Two-Face (Awesome)
Deadshot (Awesome)
Hugo Strange (Awesome)
Black Mask (maybe)
...I feel like I'm forgetting some. Aside from Scarecrow, I would love to see Firefly. I know that's not gonna happen, because that dude barely gets any love at all, even in comics. Maybe a future release, Rocksteady did say they would continue to make sequels as long as there was demand (at least I'm pretty sure that's what they said). Hopefully the next game also has Hush and the Ventriloquist.
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~Halo Rolling around at the speed of sound.
http://img593.imageshack.us/img593/2417/sonicspeed.jpg