Here's a bunch of quotes from him:
"Chris [Evans] is a good friend of mine. The movie starts in three weeks, the actor, whose character debuts April 4 in Captain America: The Winter Soldier, told MovieWeb. I know hes read the script. Hes like, Yo, man, I read the Avengers script. Its good. I was like, Really? He said, Yeah, Joss is doing rewrites, but its good. I was like, Great! So
am I in it? And he says, Ive got to go. Ill be back. What do you mean? Why cant you just tell me if Im in the movie? No one will tell me, not one person, so I gave up on it.
"No, but Ive been stalking him in London and harassing him and sending him emails. Im ready for it. I mean, Ive only met Joss twice now and Ive made it very clear to him that whatever capacity he wants to use the Falcon, Im there."
I'm like, 'So have y'all decided if I'm in Avengers 2 yet? I'll get on the bus to Albuquerque tomorrow!"
"If I get the opportunity to be in The Avengers 2, 3, 7 and 18, theres no way I would complain or balk at any part of that."