Sometimes these things are actually set in motion and it takes a while for the information to shake out.
@marni1971 isnt on the Chapek email chain... well maybe he is.
Star Wars is a good recent example. It managed to move plots and hugely shift timeframes (which certainly didn't happen overnight). It took insiders a good 3-6 months after the decision occurred for the information to start leaking its way down to their sources. But we can retrospectively see clues were there that the decision occurred well before they heard otherwise.
Hundreds of people know before they will and thousands of people know before they feel comfortable telling us.