If you haven't seen the latest trailer for Marvel's Avengers Assemble, and you are somewhat of a comic book fan, than you should definitely click the video below. What's interesting to note is that the German version of the trailer has a few extra scenes not seen in the English version.
According to io9.com, the translated new footage says:
Let's hope the movie is as good as it's all hyped up to be. And if you're wondering why The Black Window is part of the Avengers...