I'm impressed by the BBC's ability to keep their surprise Doctor Who projects under wraps. The lost episode rumors weren't specific or credible until about a week before the official announcement. And this just came out of bloody nowhere. Hope there are more surprises like this... Would really have loved to see Matt Smith regenerate completely unexpectedly, I guess they can do that when it's Peter Capaldi's turn.
They've done Night, and they're going to release Day: I hope they do Dawn of the Doctor :)