UPDATE: Marvel revealed the following plot synopsis to accompany the announcement of production:

"Armed with the astonishing ability to shrink in scale but increase in strength, con-man Scott Lang (Paul Rudd) must embrace his inner-hero and help his mentor, Dr. Hank Pym (Michael Douglas), 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."

Edgar Wright was attached to the 'Ant-Man' movie for a long, long time before he eventually dropped out (since before the Marvel movie universe was even a thing!) and in a 2006 interview, he mentioned that his script was essentially a heist movie that dealt with several generations of Ant-Men. This take seems to still be in play, confirmed by the casting of the older Douglas and the young Rudd. Exact details are still hush-hush, but a quickly changed Variety headline described Douglas as the "villain" of the movie, which is either mistake or a huge, massive spoiler ... and believe us, it wouldn't take much to make the conflicted, damaged Hank Pym into a bad guy.

In other news, Wright tweeted a still from the animated 'Avengers: Earth's Mightiest Heroes' episode "To Steal an Ant-Man' with the caption "homework," which implies that yes, the film will definitely deal with Lang's original comic origin and that yes, it is still very much a heist movie.