Considering that the first two Iron Man films were both directed by Jon Favreau, and he was essentially the first director to lead the MCU, youd think he would have returned for more directing projects as the Marvel world got bigger.
The MCU was first launched with 2008s Iron Man, directed by Jon Favreau.
Its going to take a dynamite story in order to successfully get Jon Favreau directing another Marvel movie.
If Marvel ever decides to produce Iron Man 4, wed surely see Favreau once again reprise the role of Happy.