Matthew Vaughn is looking at one of two Mark Millar comics for which he owns the movie rights as his next film, according to Hollywood Reporter.  One is The Secret Service, a new project co-created by Vaughn, written by Millar with art by Dave Gibbons.  If that’s his choice, he’ll probably write with collaborator Jane Goldman. 
Another is Superior, written by Millar with art by Leinil Francis Yu, which tells the story of a superhero and a boy with multiple sclerosis who has the chance (with a heavy cost) to become a superhero named Superior.  If Vaughn tackles that project, he will supervise the writing, according to the report. 
Vaughn, who directed Millar’s Kick-Ass (and the highly successful X-Men First Class), will not be the director if a sequel is made (see “’There’s a Window’ for ‘Kick-Ass 2’”).