Robert Downey Jr. Tells David Letterman NO Iron Man 4?? Then What IS His Big Marvel News?

What is Robert Downey, Jr. trying to tell us??<br/><br/>First he tells Ellen that another Iron Man is in the works. Later he tells David Letterman that there will be NO Iron Man 4!<br/><br/>[ Video: Robert Downey, Jr. Seems To Confirm Iron Man 4 To Ellen DeGeneres ]<br/><br/>What's going on?? Well, there may be a clue [...]