I don't expect the bad news (whatever it is) to strike immediately, as the order to trade probably happened months ago, but as the order can be reversed, allowing the trade to continue tells me that insiders know something the public doesn't know... yet.
As an employee of the company with intimate knowledge of its financials, typically he would be in a black out period at this time of the quarter. This applies not only to company officers but also anyone with knowledge of the financials (e.g., those in accounting, treasury, SEC reporting, etc.). Therefore, I don't believe he had the capability to reverse any orders in this period of time.