Have the producers said something? Haven't really been following.
You wouldn't need to tell an entire crew, just the one or two people (e.g. Feige and Coogler) who have overall responsibility, just so they have some time to come up with some alternatives to pivot to should they need to. If that then happens, they're the people who tell everyone else what to do, and so they're the people you want to have a plan.
Of course, there's no reason those two are inherently trustworthy, maybe one of them is infamously bad at keeping secrets. Ach, to be honest, not much point in speculating, what will be will be at this stage.