I got this from a reliable source, but even he questions the veracity of this story.... But here you go anyway:
Matthew McConaughey is rumored to be the front runner for Marvel's early
2011 superhero project "The First Avenger: Captain America" reports _Cinema
The character's real name is Steve Rogers, a sickly young man who was
enhanced to the peak of human perfection by an experimental serum in order to aid
the United States war effort during the Second World War.
The character remains one of the few of Marvel's most popular characters yet
to have been turned into a feature film. In many ways it still faces much
difficulty due to the nature of the uber-patriotic character in a modern world
which has become more critical of American imperialism than before.
The solution seems to be repositioning the character and placing the
emphasis on his role as the leader of 'The Avengers'. The character will team up
with Iron Man, Hulk and Thor in that film opening a few weeks later in July