The Playhouse states:
Wayne Coyne of The Flaming Lips and I have been working on Yoshimi Battles the Pink Robots for some time. Aaron Sorkin initially planned to write a book for the musical, but when it became clear that the musical would be 'sung through,' Aaron turned his attention to other projects. In the meantime, Aaron and I have started work on another play. Wayne and I continue to fine tune the libretto and score for the musical which will go into rehearsal in La Jolla in the middle of September. We are both looking forward to Yoshimi with keen anticipation. We know that we have Aaron's enthusiastic blessing on our project.
You can read the full LA Times article here.