As of now, Ant-Man's only box office competitor is Fox's adaptation Miss Peregrine's Home for Peculiar Children, directed by Tim Burton. No story details have been confirmed, but it will likely tell the origin of Hank Pym's transformation into the title character.
Edgar Wright is directing Ant-Man from a screenplay he co-wrote with Joe Cornish (Attack the Block). No cast members have been announced as of yet, and it is not known when production may begin.
Marvel is currently in production on Phase Two's Guardians of the Galaxy, with The Avengers: Age of Ultron likely to start shooting sometime in 2014.