A bit of new information is emerging about the project thanks to co-star Evangeline Lily. The former LOST actress has noted the project is, indeed, a heist film. She plays the daughter of the heroine, The Wasp, and helps Ant-Man pull off the heist.
Interestingly, she notes that both Ant-Man and The Wasp helped found The Avengers. None of this was mentioned in The Avengers films. Perhaps by weaving this information into the tale of Ant-Man, the film gets better connected to the highly successful hero-team film franchise. Avengers: Age of Ultron is sure to be a massive hit. If any of the success of that project rubs off on Ant-Man, the diminutive character could get a huge ticket sale boost. Now you see why its a good idea to integrate the whole Marvel universe?
Ant-Man just might end up being a real surprise hit.