Re: So Ms. Marvel and Falcon are definitely in? Oh and what about Ant Man?
I think by the time Avengers 3 comes around some Avengers will either be gone permanently or have much smaller Hawkeye-sized parts. I think it'll tend more and more towards the Expendables team-up style, where you have one or two guys with arcs and story, and a bunch of other guys that basically just get 2-3 cool moments.
I think in Avengers 2, we're going to see Falcon (cuz of the cartoon) and Ms. Marvel, because Whedon will want to add another Woman, and neither Scarlet Witch, She-Hulk or Wasp are available/possible right now - and Ms. Marvel can be introduced very easily with all the SHIELD and aliens flying around.