“The Avengers should start shooting some time next year, and then some time after that there’ll be a big S.H.I.E.L.D. movie.”
Well, that sure does sound awfully definitive, but you know, I don't know if I entirely trust Samuel L.'s word on this. As CinemaBlend goes on to say, he also had no idea who was starring in the Captain America movie (which he is in, by the way) and thought Chris Pine was starring in Thor. At the same time, considering the onslaught of Marvel properties being talked about for film treatments (Ant-Man, Luke Cage, etc.) this makes sense, especially since they've already got Samuel L. heavily on board for a bunch of these other movies.
For my money though, there is already a definitive Nick Fury: Agent of S.H.I.E.L.D. movie. Anything else is just superfluous.