Well, the late Charlie Smalls wrote an R&B/gospel score for The Wiz (and a great one). "The Wiz" doesn't HAVE to be an all-black show, but it does need to have singers who can comfortably do R&B and gospel.
There hasn't been any news on the progress of the revival in the last several months, but they've apparently been working hard to update the book (that's laden with early 70s slang). Des McAnuff (who's in charge of directing the production) has said that the Broadway revival will feature a multi-racial/multi-ethnic cast -- I suppose that could be fine, but I'm personally hoping that at least Dorothy (and by extension Aunt Em) and Evilene (because as Smalls wrote the music for the character, it requires a REAL powerful gospel-trained singer) will be cast with African-American performers.
I, too, immediately thought Jennifer Holliday was the obvious choice to play Evilene -- as a Dreamgirls fanatic from way back and having watched that woman deliver standing ovation after standing ovation throughout the last 20+ years, they'd be crazy not to give her a chance to stop the show nightly and totally wipe out the audience with "No Bad News" (not to mention, it'd be great to double-cast her as Aunt Em -- she'd be amazing doing "The Feeling We Once Had"). Lillias is, of course, first rate (though, as good as she is, don't forget that there was a reason that she was Jennifer's understudy in Dreamgirls -- Jennifer, even now when her voice is not quite what it was 20 years ago -- has at least an octave more range than Lillas does). Mary Bond Davis is also a good choice.
It'll be interesting to see who ends up being cast as Dorothy (I've heard that Anika Noni Rose turned it down, but I'm not sure about that). Marcy Harriell is wonderful as well. There are lots of great young singers out there.
Last I heard, McAnuff and the producers are still aiming to bring The Wiz to Broadway this season (and incidentally, I would think that the success of WICKED just makes a WIZ revival that much more likely -- if I owned the rights to THE WIZ, to my mind, when would be a better time than NOW to cash in on the name recognition and popularity of the show, when so many people can't even get in to see WICKED because it's soldout so many months in advance?), but we'll have to see if they can pull it off .....
"What a story........ everything but the bloodhounds snappin' at her rear end." -- Birdie
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"The Devil Be Hittin' Me" -- Whitney