I am sure that Flying Over Sunset will be a monster hit, because it sounds like the stupidest idea for a musical that I can recall in a very long time (well maybe not that long, but if you leave out King Kong, that statement may still be true). I personally would not spend good money, based on the little I have read, until I hear something more about it, including feedback from early viewers, via a board like this one. Why? this just sounds like the type of show to me that could be either great or atrociously bad. I learned long ago that the biggest stars and most talented people in the world can not save a show that is intrinsically bad.
I have suffered through a brilliant Meryl Streep performance watching an awful take on Alice in Wonderland, I was bored out of my mind seeing the original production of Mack and Mabel, I was miserable throughout Gary, even though I purchased the ticket for only one reason, its star....and the list goes on.
At least with the other two musicals, if you like them, you will have Bob Dylan and Tina Turner music. Plus, while it does sound bleak, Girl got excellent reviews downtown and the star of Tina got the kind of reviews that would alone warrant purchasing tickets. IMO.