We've known for a while that Robert Downey Jr's contract with Marvel expires after Avengers 3, but based on this clip with Ellen, he might be donning the suit for at least one more solo film.
A mom finds out that Robert Downey Jr. is filming in their area and has a young son who is a big Iron Man fan. So she brings him to where they were shooting, thinking she'll get Awesome Mom points, and says, "Here's Iron Man!". . . only to have her kid burst into tears upon merely seeing Robert Downey Jr.