Jessica Biel has come a long way since '7th Heaven.' That was a family friendly show where she was the rebellious daughter, but nothing like the bad ass/sex symbol she would later become. She's practically a poster child for physical fitness, so in that regard she would make for a perfect Wonder Woman. Other people thought so as well. For the 2007 movie (that would never come out), she was one of the main choices, but that movie ended up falling through.
Jessica Biel has the presence that would make her fit perfectly into the superhero world. She does have some experience in that world from the movie 'Blade: Trinity.' Oddly enough, Ryan Reynolds also played in that movie and went on to become a DC and Marvel hero. If he can do it, so can Biel.