The "phase 2" solo movies are all expected to be apart of " the avengers 2"
Iron man 3
Thor 2: the dark world
Captain America: the winter soldier
That's a pity since it would give the movie real weight if Tony's status is uncertain.
There's no way they'd ever kill off Tony Stark. This is the Marvel Cinematic Universe -- every single one of the movies thus far has been the epitome of "playing it safe." When Downey, Jr., decides that he's done with the role, it'll be re-cast; Kevin Feige has said as much.