I am firmly on the "Black Widow and Fury sucked in IM2" bandwagon.
If this actress is indeed Wasp, I expect it would be worse that that. A hot spy was still fitting with the theme of Ironman movies (that are heavily rooted in technology, and have the structure of corporate thrillers). Wasp is out of place in this kind of movies. And before you say that MCU is infinite and open and adaptative, I disagree. IM movies have a certain feel to it that excludes magic and overboard fantasy or Sci-fi elements such as tiny flying females. The fact that the Ironman suit looks "plausible" is part of its charm, and also part of their appeal to the GA.