Makes good sense to me that they canceled the first 3 previews, figuring it this way:
Whatever tech time was planned for New York was likely predicated on some, but not too many, significant changes happening between Chicago and New York. With a new, or at least fresh creative vision being brought to the project, one could expect a bit more drastic change.
Frankly, I'll bet they don't even know yet what the full extent of the changes will be yet. But by cancelling those first 3 previews, they buy themselves a little extra insurance in case the changes do indeed turn out to be more meaningful than they originally expected and they need the extra time to tech.
All of that aside, I wouldn't want to be one of the customers who bought tickets for one of those first performances, but on some level, with a new musical, that's kinda the chance you take buying so early in the run (easy for me to say having bought tickets for early May!).
"No matter how much you want the part, never let 'em see you sweat." -- Old Dry Idea commercial