Via Crave Online:
Adam McKay recently worked on rewrites of the Ant-Man script. In an interview with Crave Online, he talked about the possibility of further work with Marvel.
I just did a big rewrite on Ant-Man with Paul Rudd and had such a great time working with them that we’re kicking around ideas. But yeah, maybe I would take on one of the characters so we haven’t locked in anything, but discussions are definitely going on.
Marvel Cinematic Universe News 