Originally Posted by RaZaTrOn
The point is that these characters aren't being introduced early for the sake of the film they are in but for the sake of the collective universe they are part of. Introducing these characters in an earlier film allows the audience to be introduced to them in a rather natural way. It's all about the bigger picture.
But, coming back around to the "Is Stephanie Szostak playing Wasp?" stuff, there is no conceivable good reason for Janet Van Dyne to be introduced here,
in this manner. The "rather natural way" for her to be introduced is in Ant-Man or Avengers, where she belongs.
Janet Van Dyne is permanently attached to Hank Pym's mythos. They are as inseparable as Laurel and Hardy, Lois and Clark, Ben and Jerry, Jay and Silent Bob....