This has been a pretty poorly kept secret within the Broadway community.
The producers of the show have been adamant about trying to make a commercial transfer happen since the Off-Broadway mounting closed.
Last I heard, they'd hoped to take The Helen Hayes after what they presumed would be a short lived existence for "Xanadu." As we all know now, high box office figures and rave reviews prevented that from happening.
I still don't see the show ever being a success on a mainstream level (it couldn't even consistently sell out The Vineyard,) but stranger things have happened.
Tonya Pinkins: Then we had a "Lot's Wife" last June that was my personal favorite. I'm still trying to get them to let me sing it at some performance where we get to sing an excerpt that's gone.
Tony Kushner: You can sing it at my funeral.