So, there has been some screenings for Kick-Ass 2 : Two lucky basterds state (imdb, blu-ray.com) that Jim Carrey his screentime is very limited. He has two great scenes (trailer) but further ... not that much on his hands.
If that's true, that's different than the comic. Also, the trailers make you believe he's a huge part of the movie. I'm curious how much it will actually be.