I to have not heard anything about a confirmed Black Panther or Strange film. Nor have I heard anything about Iron Man  being in Avengers 3. However According do an old article I read on IGN and you might be able to find it if you do enough back tracking... Daredevil, the Heroes for hire, ect, ect will kind of be their own "Phase" and lead up to a Defenders show/film/mini series.