I do not know their plans.
However, if I were producing the show, and performances have been delayed as much as they have been, and it's gotten all the negative buzz that it has received regarding the management of the show, and it was the laughing stock of the industry...
...AND we're SO close to being ready for a preview performance of the show, but just need a LITTLE bit more time...
... THEN what *I* would do is inform the audience tomorrow night that they will more than likely NOT finish the performance, and if they choose to stay, then they may not a) be able to see the entire show, including the last half of ACT II, and b) be able to see all of the flying stunts planned to be performed in the show.
This way, you please the immediate audience in giving them the option to either exchange their ticket to a later preview or stay for the night and be forewarned that they may not see a complete show. And then that audience gets to go onto BWW, ALL THAT CHAT, FACEBOOK, TWITTER, etc. and tell all their friends how much they enjoyed the music and performances, how awestruck they were of the flying effects and production values, and how much of a technical mess it was.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle