Well, I certainlty wouldn't second guess anything at this point. When I interviewd Stephanie (prior to the Playbill article) she indicated to me that she was indeed a part of Stephen Schwartz's plan "early on" in the creative process.
But remember, Schwartz is in the enviable position to entice a handfull of top Broadway actors because he's constantly stirring up his projects. Just a few months ago, my last interview-ee, Christaine Noll mentioned that Stephen is toying with the idea of doing something with Christiane & "The Bakers Wife". *not that anyone is saying anything firm is in place*.
It's very likely that Stephanie could be part of a future "OZ" thing, when, if, it lingers beyond Sept. 2004, when Stephanie's contract supposedly lasts with TBFO.
Stephanie was listed as swing, understudy for Elphaba in SF. As timing would have it, it was then that she was called in to do "Oz". Really this is a huge double bonus Equity-wize for her.
No matter how you discect it, Stehpanie Block will likely be working in a Broadway Show well beyond 2004, hopefully.
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BWW regional writer "Philadelphia/South Jersey"