Do all roads lead to the Wasp in Iron Man 3 (and The Avengers 2)?

Normally, I would never post about a nebulous movie rumor, but the potential for discussion and mystery is so cool that I couldn't resist. It concerns the possible cinematic introduction of one of the actual, original founding members of the Avengers from the Marvel comics: Janet van Dyne, aka the Wasp. Rumors concerning the Wasp in the first Avengers movie definitely existed before they were...