2nd Avengers: Age of Ultron trailer.
Caveat- If you're a serious comic book fan (as I am) this will in many ways be frustrating. But, despite them not having the option of doing Age of Ultron as it is in the comics (Wolverine and the Fantastic Four are too central in it) this still looks like a cool ass movie. James Spader as the voice of Ultron is wonderfully creepy.