Well, I waited until the full countdown and was taken to an error page/access forbidden etc.
Upon reloading the page, the countdown was at 0:00:00, with little else.
I then made my way over to TheDarkKnightRises.com where there is a similar looking page with some sort audio, with female voices repeating a string of numbers.
I'm not much of a codebreaker, but I'm working in it!
Operation Early Bird has commenced!
Update: OperationEarlyBird.com now reveals a map with a form to enter coordinates (from TheDarkKnightRises.com).
Update #2: When a coordinate is entered correctly, a blip is revealed with a time and date (10:00pm 12/13/11).
Update #3: The locations reveal early IMAX screenings for the prologue, with the site giving away free tickets for the early screening (3 Days ahead of time and without paying for Mission Impossible: Ghost Protocol).
The Dark Knight Rises hits theaters July 20th, 2012 and is directed by Christopher Nolan starring Christian Bale as Batman, Tom Hardy as Bane, Anne Hathaway as Selina Kyle/Catwoman, Gary Oldman as Commissioner Gordon, Morgan Freeman as Lucius Fox, Michael Cain as Alfred, Juno Temple and Josh Pence as a young Ra's al Ghul.
Head on over to the Cosmic Book News The Dark Knight Rises Movie Hub for even more news, trailers and images.