Micheal Douglas has been confirmed to play Hank Pym in the Ant-Man film! Paul Rudd will be Scott Lang, which explains why they confirmed Rudd, but not who he was playing.
The film has already been described as a heist style film, so presumably it will revolve around Lang stealing Pyms Ant-Man gear, and using it himself.
Can't wait for this, it sounds like it could be phenomenal.