Don't hold your breath :o, there's a number of DC/Warner Bros movies that were greenlight a few years ago that are either now stuck in development or...
I can't see them using Super-Skrull before the FF get introduced unless they alter his gimmick to where his powers aren't based around the Fantastic...
I think that's a vaguer and more ambiguous issue than the Mysterio thing...which the longer she delays, the more the god of plot decrees it will blow...