It looks like Entertainment Weekly ran with this idea while covering the recent Disney/Marvel deal. Something about this didn't sit well with the people at CHUD so they dropped would-be Ant-Man director Edgar Wright (Shaun of the Dead) an email, and this is what he said regarding his involvement:
"I am still attached to Ant-Man and indeed am still working on a second draft with Joe Cornish. That had to take a back seat while I worked on Scott Pilgrim, but am keen to get back into it once I get into post.
I just spoke to Kevin Feige for the first time since I wrapped and we are meeting this week to discuss the next phase. It's been something that I have worked on for over five years on and off. There's even a treatment I wrote that dates even further back than that.
It's true that the character is not considered one of the Marvel brand leaders and that is precisely what excites me about it. I want to make a film inside the Marvel Universe that is something a little different; a genre film within the superhero genre so to speak.
The news that Pixar is involved is not wholly accurate and a little premature to comment on. I love Pixar's work more than anyone and indeed would love to collaborate with them.
I'm not sure though that they would want to do a 'shrinking' film as a Pixar animation - since Toy Story and A Bug's Life already cover this territory to some extent. Am guessing that someone just speculated on the 'bug' angle and tried to put two and two together.
My spin on Ant-Man is very different than a straight superhero origin - and very much live action.
At some point in this century, I intend to stop talking about it and make the damn thing."