It will include at least two of the Ant-Men including Dr. Hank Pym and burglar turned-hero Scott Lang (2nd Ant-Man) which was confirmed by MTV. Also the film's leading lady Janet van Dyne wears a similar suit and is known as the Wasp. It would be nice to see another heroine in the film perhaps Lang's daughter Cassie. She becomes a Young Avenger known as Stature who shares the same powers as her father.
ThePlaylist was able to speak with Joe Cornish which he became coy when the question of Ant-Men was raised again. However, they mention several "Ant-Men" are rumored which could mean SHIELD Agent Eric O'Grady (3rd Ant-Man) could be in the film as well.
"We had heard that at one point Cornish and Wright were going to put several of the Ant-Men (meaning people that had put on superhero scientist Hank Pym’s suit) into the script, meaning that they could have thrown in our personal favorite Ant-Man – Eric O’Grady, low-level S.H.I.E.L.D. Agent turned shadily “Irredeemable” Ant Man. "
Cornish smiled at our implication and said, slyly, “No comment.” He then started to say something, “Well, you know…” before shutting himself off with another “No comment.”
Edgar Wright talked to VanityFair about his vision for the film which will be a "high-tech spy heist film". The espionage angle gives further fuel that a team could be put together. Wright had been in contention to direct Mission Impossible: Ghost Protocol which has a similar theme minus superpowers. I wouldn't be shocked to see Ant-Man closer to Bond or Mission Impossible than any of the other Marvel films.
"I think it's a really interesting high-concept idea. [...] I know there's a big stigma attached to it, mostly because every movie about shrinking has been about people in peril. I think it'd be great to do a shrinking film about a bad-ass secret agent. [...] Even something like The Incredible Shrinking Man, which is a fantastic film, is about a guy in trouble. But this is going to be nothing like that. It's essentially a high-tech spy heist film with somebody with a very particular power."