You are correct sir. Disney acquired Marvel in 2009 but the Avengers was the first film they distributed. But Iron Man 2 and Thor were both developed under their ownership. And from what I gather, Disney's model with these films is to hire the best writers and directors to helm them. Those that are intimately connected with the franchise in question. They hit it out of the park by hiring Joss Whedon despite his relative inexperience. Whedon's time as a writer for Marvel was what made him a perfect choice.
Hopefully, Disney will chose someone who is as much a fan boy of the Star Wars universe as Whedon was of Marvel.