During an interview with IGN, Jaimie Foxx revealed that he was approached to play Luke Cage. He also discussed his superhero fandom and where it spawned from. He also talks about why Spider-Man is his favorite superhero.
As for Luke Cage, all he says is that he was approached to play him back in the day but that it didn't work out at the time. I really like the idea of Foxx as Cage. I think he would still be an awesome choice for the role.
Marvel is currently moving forward with Luke Cage as a series on Netflix, but if that series is a hit, I guess there is always a chance the character could find his way to the big screen, he just most likely won't be played by Foxx. The actor has also been wanting to play Spawn for Todd McFarlane for years, and hopefully one day that happens. You can watch the interview below.