In case you missed the scene after the credits:

[spoiler]Tony Stark returns home after the press conference and you see Samuel L Jackson in his house staring out the window overlooking the ocean. He turns around and you see him with an eyepatch and he tells Tony "My name is Nick Fury. I am the leader of SHIELD and I want to talk to you about the Avenger Initiative." (or something to that effect)[/spoiler]