Although it is potentially really, really disappointing there must've been a good reason.
I would just suggest that BW explain the urgency in their posts.
I went into work to play and logged in 10min before the server shutdown. I found the cheerful post about the regular Tuesday shutdown and the passing note about 4hrs of downtime, but couldn't work out why it was so desperately urgent. Obviously, no need to talk us through the latest exploit or give us inappropriate details, but a brief explanation for the urgency might dignify the playerbase.