*completely freaks out*
Oooooh, this is super cool news! I hope he's majorly involved with the script too, because that's definetely his strongest area...
For those of you who are unaware, Joss Whedon is important to me personally because of his work on the X-Men comics, and of course his creation of a new favorite show of mine - "Firefly." (He's most famous for creating "Buffy the Vampire Slayer" which has a pretty good rep among people I respect, though I think it would be too scary for me). Whedon is excellent at creating strong characters and working with ensemble casts, as well as writing complex plots with deep themes and great dialogue. So we could really get a good film here! :)