I doubt they will. I myself would LOVE to have someone from F4 (preferably Johnny even though Ben would prob make the most sense) and Spidey in the Avengers. I feel that the Avengers will end up being Ironman, Hulk, Thor, Captain America, and Antman. But during the movie Fury will add Black Widow to the team and then Antman will meet Wasp.
It would however be cool if they found a way to bring in Scarlet Witch, even have cameos by Magneto (Ian) and Quicksilver.
