It has been nagging at my mind for months now since we got that sneak peak of 'The Mighty Avengers' in WIzard a few months back.
It seemed that the team leader was Mrs. Marvel, she was shouting orders and trying to make sure everyone played by the rules of "Don't destroy too much property."
However 'Iron Man' was there and he was not barking out orders. This seemed unusual to me since Tony is the Civil War leader and I dont see him not wanting to command. It looks like they are prepping Tony to take over Shield too, so he wont have time for Mighty Avengers. At least not at first.
Mrs. Marvel also mutters something about Iron man trying out his new powers. This leads me to believe that who ever is in the armor is not use to the suit's capabilities.
So who could possibly be in the armor?
Warmachine? (Jim Rhodes?)