Back in December, it was reported that Paul Rudd was cast as "Ant-Man" but it was unclear which one he'd be. It was speculated that he would be playing Scott Lang, the Ant-Man that stole Hank Pym's suit.
If Rudd's playing Lang, who will play Hank? It's just been announced that Michael Douglas will play Hank Pym.
"With Hank Pym's rich history in the Marvel Universe, we knew we needed an actor capable of bringing the weight and stature to the role that the character deserves," said Marvel Studios President Kevin Feige. "We felt incredibly relieved when Michael Douglas agreed to step into the part with the charm and fortitude he brings to every character he inhabits, and couldn't be more excited to see what he will do to bring Hank Pym to life."
It's been said before that Hank Pym saw some action as the original Ant-Man in the 60s, as in TALES TO ASTONISH. Scott Lang must come along to steal the suit or something. The movie opens July 31, 2015.
Source: Marvel