Compared to the two's interview with the New Haven Reigster, Gay and Jones expand a bit in this interview on the songs Billie Joe wrote for the play. Jones states that Billie Joe sent a few songs he had already written and were archived in his home studio, songs that "weren't appropriate for Green Day."
This makes it sound like the versions Billie Joe recorded himself will be played during the play. Just the other day, one of the songs, "Follow You Around," was released.
We will find out tomorrow, Friday, March 14th, what the songs sound like as the production premieres. More information is on the Yale Repertory Theatre's website.
When comparing the film to the musical, Jones says:
Last July, Michael Mayer, the film and musical's director, confirmed that Billie Joe will play St. Jimmy in the film.
Since the script is still being worked on it's safe to assume actual production of the film - much less its release - is still a ways off. None-the-less, it's good to know progress is still being made on it.
Thanks to sabrina for sending in this news.