I didn't see anything about this yet and recent developments have been...interesting.
First, in addition to Paul Rudd - now confirmed as Scott Lang - they've announced who will play Hank Pym. If you haven't heard it yet, it's just insane, like more bizarre and honestly just plain fun to think about than James Spader as Ultron.
http://marvel.com/news/movies/2014/1...arvels_ant-man
Second, along with another actor in a supporting or villain role, we will know who is the female lead - fingers crossed it's for Janet Van Dyne - in about 3 months when the film is to start production.
http://collider.com/ant-man-michael-pena/