The trailer gives us more detail into Black Widow (Scarlett Johansson) and Whiplash (Mikey Rourke), but still focuses on the story of Stark (Robert Downy Jr.) accepting his fate as Iron Man. The trailer also gives us a look into his business arch-rival Justin Hammer (Sam Rockwell) and even a shot of Nick Fury (Samuel L Jackson) expanding the Marvel Universe that was made back in 2008 at the end of Iron Man. 

Other pretty cool parts to the trailer include the portable Iron Man suit and some great one-liners.