Mark Millar, the writer of Kick-Ass recently spoke to Empire & gave "a few tidbits" on his planned sequel.
"It’s gangs going all over New York filming atrocities on their cell phones and putting them on the internet, trying to outdo each other, all at the behest of Red Mist. My idea for Red Mist was to introduce a supervillain that made Heath Ledger’s Joker look like Cesar Romero’s Joker. He’s basically Charles Manson as a supervillain."
"Chris said to me he hates the fact that people always call him McLovin’. So my aim was to give him a new name for people to call him. And the villain calls himself The Motherfucker. Chris is The Motherfucker, the worst of all supervillains. But at the same time we continue the story of Dave and all the complications in his life as he gets deeper and deeper into this dangerous hobby he’s got where he dresses up as a superhero and gets beaten up every night. So he forms a gang and what you’ve got then is all the heroes versus all the villians in a big gangfight."