Creator Mark Millar has confirmed there will be a third "Kick-Ass" movie to complete the trilogy and a new "Hit-Girl" comic book series available February 2018:

The first "Kick-Ass" feature released in 2010 on a budget of $30 million, earned $100 million world-wide, then sold over 1 million DVDs, scoring an additional $24 million.
"Kick-Ass 2" on a budget of $28 million, released in 2013, earned $63 million world-wide plus an additional $15 million in DVD sales.
There is a dedicated fan-base including director Quentin Tarantino, who placed "Kick-Ass 2" as one of his top 10 fave films of 2013 ...
...and supports Chloƫ Grace Moretz' ongoing portrayal as crime-fighter 'Mindy Macready', aka 'Hit-Girl'.
"I'd always planned it as three books and three movies," said Millar about "Kick-Ass 3".
Click the images to enlarge and Sneak Peek Chloƫ Grace Moretz as 'Hit-Girl'...