The film, which is being described as a "heist" movie with superheroes, has reportedly retained some of the structure from its original script, including flashbacks that may tie into the events of Marvel's upcoming Agent Carter TV series.
You can check it out below, along with Marvel's official description of the film.
The next evolution of the Marvel Cinematic Universe brings a founding member of The Avengers to the big screen for the first time Marvel Studios' Ant-Man. Armed with the astonishing ability to shrink in scale but increase in strength, master thief Scott Lang must embrace his inner-hero and help his mentor, Dr. Hank Pym, protect the secret behind his spectacular Ant-Man suit from a new generation of towering threats. Against seemingly insurmountable obstacles, Pym and Lang must plan and pull off a heist that will save the world.