Speculation about the latter began with the actor's Twitter, where he's been giving hints, such as that he's got a three-picture deal with Marvel Studios, he won't be wearing a mask and he'll be playing some kind of S.H.I.E.L.D. agent who may or may not have been one or an Avenger in the comics. He also claimed he'll be at Comic-Con this summer to announce the part officially. So far those clues offer no reason he wouldn't be Ant-Man or even Hawkeye, but Marvelous News heard from an inside source that Pennington is not Hawkeye. And as for Ant-Man, the site reports that Fillion is "pretty much locked to be Henry Pym."
Now here come the complete denials, which are also to be taken with a grain of salt. The Playlist asked Wright directly about the Fillion part and received the following: "Not as far as I know!" That sounds like a variation of "no comment," so maybe don't rule him out just yet? Same goes for Pennington's flat denial to a follower when asked implicitly if he's doing Ant-Man. Before seeing that, I had the notion that maybe Fillion would play Pym as the original Ant-Man and then Pennington could play Scott Lang for the takeover.
Of course, the Fillion rumor could just be a made up pipe dream for fans wanting him to reunite with Avengers director Joss Whedon. And the relatively unknown Pennington is likely someone less prominent. People are guessing Wendell Vaughn/Quasar, Quicksilver and Dum Dum Dugan. What is your guess for either actor? And what would be your wish?