Earlier today, the first trailer for Avengers: Age of Ultron leaked online. Marvel amusingly blamed Hydra for the leak, then went ahead and made the decision to put the trailer out officially in HD.
To say that it's incredible is an understatement. James Spader as the voice of Ultron combined with the creepy use of I've Got No Strings from Pinocchio make for a vision that's much darker than the original Avengers.
More details of the trailer and the movie can be found here.
Avengers: Age of Ultron hits theaters on May 1st of 2015.