In 2001 O'Brien confirmed that he was working on a new sequel of his original play "The Rocky Horror Show". Fans titled it "Rocky Horror: The Second Coming", but he never confirmed the title. He did, however, state that it would include elements from the unmade Rocky Horror Shows His Heels and Revenge of the Old Queen.
"Frankie Phoenix" was the only song leaked by O'Brien, and was stated to illustrate Frank-N-Furter's resurrection. It had also been intended to become a film like its predecessor if the play had become a financial hit, but after multiple false starts, the project has fallen into a development hell.
To read more about Rocky Horror Wiki: