Looks like it's Hit Girl: Origins. Oh, you thought you may have seen the origins of Hit Girl in Kick Ass, but it looks as if there is more to come. And it's one way to bring back
Nicolas Cage Big Daddy.
A lot of people asking where they can get the source material for the new Kick-Ass 2 movie. So far there's been THREE collections in the series and the final volume, Kick-Ass 3, is being published at the moment, collected around Easter next year. I've got an idea for a HIT-GIRL ORIGINS series, but dunno if I'll ever write it as booked up for a couple of years on various other things.
With Jupiter's Legacy sales numbers dropping off but Kick Ass 3 sales ramping up, it might come sooner rather than later.