The above HuffPost article links to an interview he did with them about his past and current projects like The Glass Menagerie.
He says things like, "I think just where I am in my work and what I want to accomplish I think it is good to have a little flexibility and a little bit of freedom" and he brings up that A.R.T productions, like Porgy and Bess and Pippin, have been Broadway-bound (although saying that the Broadway goal is not the point of doing it). Maybe, for him, he's ready for his Broadway debut, and this could be it.
Quinterview