It looks like Ant-Man has found its lead actress. Marvel is is currently in talks with Evangeline Lilly (The Hobbit: The Desolation of Smaug) to be in the Edgar Wright-directed movie. If cast, she will join Paul Rudd, Michael Douglas, and Michael Pena.
According to Variety, there's a possibility that she will play Hank Pym's daughter and Scott Lang's love interest. This isn't confirmed, and you should probably know that Pym didn't have a daughter in the comics. But that doesn't mean Wright and screenwriter Joe Cornish couldn't have added a new character to the story. Of course, the other possibility could be Wasp.
We'll eventually find out everything we want to know. Whoever the character is, it seems like Lilly would be a great addition to the Marvel cinematic universe. The film is set to go into production in April.