See the whole video interview below, but among the good bits...
Regarding Captain America TFA:
“I know that Captain America film takes place primarily during the Battle of Britain in the 40’s. So, when I heard that I certainly pitched the idea that I could play my own grandfather, but so far they haven't called.”
About a Nick Fury movie...
“I’ve heard about the Nick Fury movie. I would assume that if they make a Nick Fury movie they’re gonna have to use Coulson cause he’s Nick’s right hand man. That’s still a couple of movies away and I’m hoping nothing happens to Agent Coulson cause I don’t know what I would do for work.”
About his involvement in The Avengers...
"...Joss Whedon comes up to me (during SDCC), hey listen, you're in The Avengers. We're gonna introduce you as part of The Avengers. And I was like, GET OUTTA HERE! ...I start the Avengers in a couple months. ...I'm told in February, in Manhattan."