I've saved the worst for last. I like to stay open minded ("There's no such thing as a bad idea, only poor execution"), but I don't have very high hopes for any of the following:
Happy Days: It isn't just Hollywood that's recycling nostalgia. But here we have nostalgia for nostalgia: a tuner based on the old Happy Days TV show. Starring Old Kid on the Block Joey McIntyre. Book by the TV show's producer Garry Marshall, music and lyrics by the vertically-challenged Paul Williams. I guess the idea of the Fonz breaking into song isn't a bad one. But Marshall has never, to my knowledge, helmed a musical. And Williams hasn't really done anything of note in about 25 years. Of course, one burning question remains: Does Joanie love Chachi? And will she express that love in song form?
Waiting for the Moon: Is it wrong that we've automatically come to expect unmitigated dreck from composer Frank Wildhorn? Well, at this point, he's guilty until proven innocent. At least here, he's not working with the man who seems to have misplaced whatever talent to which he might originally have laid claim, Leslie Bricusse (Jekyll and Hyde, Victor/Victoria). Waiting for the Moon is based on the turbulent lives of Zelda and F. Scott Fitzgerald. One can only assume that the musical will have a similarly rocky road ahead.
Dirty Dancing: Audiences in London seem to have a higher tolerance for crap, which is ironic given the theatrical legacy of that city. No mention of who's penning any additional songs here, but they are keeping the "Time of My Life" song, so this looks like a Footloose special: a compilation of previously existing tunes, perhaps supplemented by a new song or two. I guess making a musical out of this admittedly sweet movie makes sense, but the fact that there has already been a touring, semi-staged, concert version of Dirty Dancing -- not to mention a thoroughly forgettable cinematic sequel -- sort of cheapens its future prospects as a legitimate musical.