I think somthing like a Cell Phone to call out your Thugs would be a cool idea insted of a whistle.
I just had a friend SK me to level 24 to try out one of the mayhem missions. So I got to see the Arsonist. The mission crashed so I got to see a little of what he could do.
He looks totally different between the other two thugs, I got to see two of them before the game crashed.
When he first comes out he can throw maltov cocktails and when he's given equip he can breath fire. It's an awesome animation too, unlike the normal one that Fire users do he has a lighter and then he shoots fire.
Only problem, he's an aggro magnet, even on Defensive. I had to re-call him three times!
Still looking really cool, can't wait to see the Inforcers!